Speedo wrong, but is that all?
10-03-2003, 08:18 PM
#11
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
I have what is clearly the world's worst news feed being that none of the
replies to my original post have shown up yet, but I can see on Google that
there have been quite a few. Thanks to all that have replied! Here's what
I've done and discovered so far, but it's raised a few more questions as a
result (isn't that always the way?).
I put one rear tire up in the air, shifted into neutral, marked a spot on
the tire, spun it twice and counted the number of turns of the driveshaft.
This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
for any slop in the process, I'm guessing this means I have 3.07 gears on
the rear. It's a 1994 with a 4.0L engine and a five speed manual
transmission, which I'm assuming is reasonable. So then I tried this same
procedure with the front, but... nothing. With one tire on the ground, one
in the air, and the various gear selectors moved into all kinds of different
positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
to move while I turned the wheel. I don't see any sort of locking mechanism
on the wheel hubs, and the only tube running into the front differential
that seems like it migh control something on the inside seems to only be a
vent tube that runs up by the radiator, so I'm not sure what I'm missing
here... sometimes you can turn the driveshaft by hand and get a very slight
bit of movement in the wheel, but definitely nothing solid and absolutely
not the other way around. Is there some different trick I should be trying
here? I'm a stranger to the ways of 4WD, and my shop manual is still four
days out, so I'm at a loss for what to try next. It seems to me the lgoic
behind the procedure is sound, but then I could very well be overlooking
something critical.
The speedometer is most decidedly an electronic one and not cable driven,
and presumably has been since the day it was born as the gauges have never
been changed. The tires are slightly larger than the originals, but that
was the case before the accident and the speedo offset due to that was a
fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
see that quadratec.com sells a recalibration box, plus there's a bevy of
potential speedometer gear changes that can be done, so once I figure out
exactly why it's incorrect I'll make my next move. It is possible that some
portion of the drivetrain was swapped out during the repair, especially
considering how much cleaner the transmission is than various other parts of
the car... but that information is only suggestive of what happened, and not
conclusive.
I'll get under there this weekend and pop out the current speedo gear to see
what it is. I don't want to pop open the front differential cover and
actually count gear teeth, but if that's the only solution then I will.
It's probably overdue for a fluid change anyhow. There's also a temptation
to just put the thing up on four stands and put it in gear to see what
happens... might be a faster way of figuring out what's up with the front
differential!
Thanks again to everyone who has helped on this rather perplexing problem,
hopefully I'll be to the bottom of it soon.
Bryan
10-03-2003, 08:18 PM
#12
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
I have what is clearly the world's worst news feed being that none of the
replies to my original post have shown up yet, but I can see on Google that
there have been quite a few. Thanks to all that have replied! Here's what
I've done and discovered so far, but it's raised a few more questions as a
result (isn't that always the way?).
I put one rear tire up in the air, shifted into neutral, marked a spot on
the tire, spun it twice and counted the number of turns of the driveshaft.
This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
for any slop in the process, I'm guessing this means I have 3.07 gears on
the rear. It's a 1994 with a 4.0L engine and a five speed manual
transmission, which I'm assuming is reasonable. So then I tried this same
procedure with the front, but... nothing. With one tire on the ground, one
in the air, and the various gear selectors moved into all kinds of different
positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
to move while I turned the wheel. I don't see any sort of locking mechanism
on the wheel hubs, and the only tube running into the front differential
that seems like it migh control something on the inside seems to only be a
vent tube that runs up by the radiator, so I'm not sure what I'm missing
here... sometimes you can turn the driveshaft by hand and get a very slight
bit of movement in the wheel, but definitely nothing solid and absolutely
not the other way around. Is there some different trick I should be trying
here? I'm a stranger to the ways of 4WD, and my shop manual is still four
days out, so I'm at a loss for what to try next. It seems to me the lgoic
behind the procedure is sound, but then I could very well be overlooking
something critical.
The speedometer is most decidedly an electronic one and not cable driven,
and presumably has been since the day it was born as the gauges have never
been changed. The tires are slightly larger than the originals, but that
was the case before the accident and the speedo offset due to that was a
fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
see that quadratec.com sells a recalibration box, plus there's a bevy of
potential speedometer gear changes that can be done, so once I figure out
exactly why it's incorrect I'll make my next move. It is possible that some
portion of the drivetrain was swapped out during the repair, especially
considering how much cleaner the transmission is than various other parts of
the car... but that information is only suggestive of what happened, and not
conclusive.
I'll get under there this weekend and pop out the current speedo gear to see
what it is. I don't want to pop open the front differential cover and
actually count gear teeth, but if that's the only solution then I will.
It's probably overdue for a fluid change anyhow. There's also a temptation
to just put the thing up on four stands and put it in gear to see what
happens... might be a faster way of figuring out what's up with the front
differential!
Thanks again to everyone who has helped on this rather perplexing problem,
hopefully I'll be to the bottom of it soon.
Bryan
10-03-2003, 08:31 PM
#13
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
"The Hurdy Gurdy Man" <bryan@linux.webicommerce.com> wrote in message
news:bll3lg$qqj$1@nnrp.atgi.net...
....
> I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
I think you'll be very displeased when you open it... I think you're
going to find lots of broken metal.
__
Steve
..
10-03-2003, 08:31 PM
#14
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
"The Hurdy Gurdy Man" <bryan@linux.webicommerce.com> wrote in message
news:bll3lg$qqj$1@nnrp.atgi.net...
....
> I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
I think you'll be very displeased when you open it... I think you're
going to find lots of broken metal.
__
Steve
..
10-03-2003, 08:31 PM
#15
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
"The Hurdy Gurdy Man" <bryan@linux.webicommerce.com> wrote in message
news:bll3lg$qqj$1@nnrp.atgi.net...
....
> I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
I think you'll be very displeased when you open it... I think you're
going to find lots of broken metal.
__
Steve
..
10-03-2003, 08:38 PM
#16
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
You have a YJ and the axle is disconnected because there is no
vacuum in the diagram controlling that lever.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
vacuum in the diagram controlling that lever.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
10-03-2003, 08:38 PM
#17
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
You have a YJ and the axle is disconnected because there is no
vacuum in the diagram controlling that lever.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
vacuum in the diagram controlling that lever.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
10-03-2003, 08:38 PM
#18
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
You have a YJ and the axle is disconnected because there is no
vacuum in the diagram controlling that lever.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
vacuum in the diagram controlling that lever.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
10-03-2003, 10:05 PM
#19
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
Man, you aren't going to be a happy camper when you open that front up.
The 94's have a locked front axle setup, no vacuum or anything else to
turn it on. You spin one wheel in the air, the driveshaft must turn....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
The 94's have a locked front axle setup, no vacuum or anything else to
turn it on. You spin one wheel in the air, the driveshaft must turn....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
10-03-2003, 10:05 PM
#20
Guest
Posts: n/a
Re: Speedo wrong, but is that all?
Man, you aren't going to be a happy camper when you open that front up.
The 94's have a locked front axle setup, no vacuum or anything else to
turn it on. You spin one wheel in the air, the driveshaft must turn....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
The 94's have a locked front axle setup, no vacuum or anything else to
turn it on. You spin one wheel in the air, the driveshaft must turn....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
The Hurdy Gurdy Man wrote:
>
> I have what is clearly the world's worst news feed being that none of the
> replies to my original post have shown up yet, but I can see on Google that
> there have been quite a few. Thanks to all that have replied! Here's what
> I've done and discovered so far, but it's raised a few more questions as a
> result (isn't that always the way?).
>
> I put one rear tire up in the air, shifted into neutral, marked a spot on
> the tire, spun it twice and counted the number of turns of the driveshaft.
> This gave me about 3.08 ~ 3.10 turns for two tire rotations... accounting
> for any slop in the process, I'm guessing this means I have 3.07 gears on
> the rear. It's a 1994 with a 4.0L engine and a five speed manual
> transmission, which I'm assuming is reasonable. So then I tried this same
> procedure with the front, but... nothing. With one tire on the ground, one
> in the air, and the various gear selectors moved into all kinds of different
> positions (in gear, neutral, 2WD, 4WD, etc.) I couldn't get the driveshaft
> to move while I turned the wheel. I don't see any sort of locking mechanism
> on the wheel hubs, and the only tube running into the front differential
> that seems like it migh control something on the inside seems to only be a
> vent tube that runs up by the radiator, so I'm not sure what I'm missing
> here... sometimes you can turn the driveshaft by hand and get a very slight
> bit of movement in the wheel, but definitely nothing solid and absolutely
> not the other way around. Is there some different trick I should be trying
> here? I'm a stranger to the ways of 4WD, and my shop manual is still four
> days out, so I'm at a loss for what to try next. It seems to me the lgoic
> behind the procedure is sound, but then I could very well be overlooking
> something critical.
>
> The speedometer is most decidedly an electronic one and not cable driven,
> and presumably has been since the day it was born as the gauges have never
> been changed. The tires are slightly larger than the originals, but that
> was the case before the accident and the speedo offset due to that was a
> fairly minor one. Certainly not the 15 or so MPH it's reading off now. I
> see that quadratec.com sells a recalibration box, plus there's a bevy of
> potential speedometer gear changes that can be done, so once I figure out
> exactly why it's incorrect I'll make my next move. It is possible that some
> portion of the drivetrain was swapped out during the repair, especially
> considering how much cleaner the transmission is than various other parts of
> the car... but that information is only suggestive of what happened, and not
> conclusive.
>
> I'll get under there this weekend and pop out the current speedo gear to see
> what it is. I don't want to pop open the front differential cover and
> actually count gear teeth, but if that's the only solution then I will.
> It's probably overdue for a fluid change anyhow. There's also a temptation
> to just put the thing up on four stands and put it in gear to see what
> happens... might be a faster way of figuring out what's up with the front
> differential!
>
> Thanks again to everyone who has helped on this rather perplexing problem,
> hopefully I'll be to the bottom of it soon.
>
> Bryan
