Speedometer Recalibration
04-07-2005, 06:10 PM
#11
Guest
Posts: n/a
Re: Speedometer Recalibration
The trans won't matter at all, and the tcase is the factory fittment.
The difference you are having is the gear ratio in the diffs and the 33"
tires. Having said that, I suppose the tall tires and the 4.56s would cancel
each other out, and the error should be pretty small. The speedo itself can
be dirty inside and this will cause it to be slow. (I didn't say if the
error was + or -.)
"Rusted" <noEmail@please.com> wrote in message
news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
>
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:686dne-eBolYOcjfRVn-vg@ez2.net...
> > The transmission didn't change the speedo calibration, the diff gears
did.
> > I
> > haven't got the link you asked for, but there is one - my guess is that
> > Bill
> > is sending it within the hour.
> >
> > You will need to know the tire diameter and the diff ratio, and this
will
> > drive you to a specific gear size. The gear is easily replaced - find
the
> > speedo cable entering the tcase near the back on the driver's side, and
> > take
> > the single bolt out and remove the gear. Remove the E-clip that holds
the
> > gear on and replace the old gear with the new one. The shaft that the
gear
> > fits onto is on a round plate, but the shaft is off center. You have to
> > turn
> > the plate to align the gear with the gear inside the tcase. There are
> > numbers and guide lines on the plate and the tcase, align the number
that
> > matches the gear count, and you should be good.
> >
> >
> >
> >
> >
> >
> > "Rusted" <noEmail@please.com> wrote in message
> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
> >> Either there is not a lot of info, or I am using the wrong key words to
> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
> >> that
> >> now has a T-18 transmission. Also the gears have been swapped to 4.56.
> > Any
> >> links as to where to look to find the right part or to calculate the
> >> right
> >> part needed?
> >>
> >>
> >>
> >
> >
>
>
>
The difference you are having is the gear ratio in the diffs and the 33"
tires. Having said that, I suppose the tall tires and the 4.56s would cancel
each other out, and the error should be pretty small. The speedo itself can
be dirty inside and this will cause it to be slow. (I didn't say if the
error was + or -.)
"Rusted" <noEmail@please.com> wrote in message
news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
>
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:686dne-eBolYOcjfRVn-vg@ez2.net...
> > The transmission didn't change the speedo calibration, the diff gears
did.
> > I
> > haven't got the link you asked for, but there is one - my guess is that
> > Bill
> > is sending it within the hour.
> >
> > You will need to know the tire diameter and the diff ratio, and this
will
> > drive you to a specific gear size. The gear is easily replaced - find
the
> > speedo cable entering the tcase near the back on the driver's side, and
> > take
> > the single bolt out and remove the gear. Remove the E-clip that holds
the
> > gear on and replace the old gear with the new one. The shaft that the
gear
> > fits onto is on a round plate, but the shaft is off center. You have to
> > turn
> > the plate to align the gear with the gear inside the tcase. There are
> > numbers and guide lines on the plate and the tcase, align the number
that
> > matches the gear count, and you should be good.
> >
> >
> >
> >
> >
> >
> > "Rusted" <noEmail@please.com> wrote in message
> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
> >> Either there is not a lot of info, or I am using the wrong key words to
> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
> >> that
> >> now has a T-18 transmission. Also the gears have been swapped to 4.56.
> > Any
> >> links as to where to look to find the right part or to calculate the
> >> right
> >> part needed?
> >>
> >>
> >>
> >
> >
>
>
>
04-07-2005, 06:10 PM
#12
Guest
Posts: n/a
Re: Speedometer Recalibration
The trans won't matter at all, and the tcase is the factory fittment.
The difference you are having is the gear ratio in the diffs and the 33"
tires. Having said that, I suppose the tall tires and the 4.56s would cancel
each other out, and the error should be pretty small. The speedo itself can
be dirty inside and this will cause it to be slow. (I didn't say if the
error was + or -.)
"Rusted" <noEmail@please.com> wrote in message
news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
>
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:686dne-eBolYOcjfRVn-vg@ez2.net...
> > The transmission didn't change the speedo calibration, the diff gears
did.
> > I
> > haven't got the link you asked for, but there is one - my guess is that
> > Bill
> > is sending it within the hour.
> >
> > You will need to know the tire diameter and the diff ratio, and this
will
> > drive you to a specific gear size. The gear is easily replaced - find
the
> > speedo cable entering the tcase near the back on the driver's side, and
> > take
> > the single bolt out and remove the gear. Remove the E-clip that holds
the
> > gear on and replace the old gear with the new one. The shaft that the
gear
> > fits onto is on a round plate, but the shaft is off center. You have to
> > turn
> > the plate to align the gear with the gear inside the tcase. There are
> > numbers and guide lines on the plate and the tcase, align the number
that
> > matches the gear count, and you should be good.
> >
> >
> >
> >
> >
> >
> > "Rusted" <noEmail@please.com> wrote in message
> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
> >> Either there is not a lot of info, or I am using the wrong key words to
> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
> >> that
> >> now has a T-18 transmission. Also the gears have been swapped to 4.56.
> > Any
> >> links as to where to look to find the right part or to calculate the
> >> right
> >> part needed?
> >>
> >>
> >>
> >
> >
>
>
>
The difference you are having is the gear ratio in the diffs and the 33"
tires. Having said that, I suppose the tall tires and the 4.56s would cancel
each other out, and the error should be pretty small. The speedo itself can
be dirty inside and this will cause it to be slow. (I didn't say if the
error was + or -.)
"Rusted" <noEmail@please.com> wrote in message
news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
>
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:686dne-eBolYOcjfRVn-vg@ez2.net...
> > The transmission didn't change the speedo calibration, the diff gears
did.
> > I
> > haven't got the link you asked for, but there is one - my guess is that
> > Bill
> > is sending it within the hour.
> >
> > You will need to know the tire diameter and the diff ratio, and this
will
> > drive you to a specific gear size. The gear is easily replaced - find
the
> > speedo cable entering the tcase near the back on the driver's side, and
> > take
> > the single bolt out and remove the gear. Remove the E-clip that holds
the
> > gear on and replace the old gear with the new one. The shaft that the
gear
> > fits onto is on a round plate, but the shaft is off center. You have to
> > turn
> > the plate to align the gear with the gear inside the tcase. There are
> > numbers and guide lines on the plate and the tcase, align the number
that
> > matches the gear count, and you should be good.
> >
> >
> >
> >
> >
> >
> > "Rusted" <noEmail@please.com> wrote in message
> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
> >> Either there is not a lot of info, or I am using the wrong key words to
> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
> >> that
> >> now has a T-18 transmission. Also the gears have been swapped to 4.56.
> > Any
> >> links as to where to look to find the right part or to calculate the
> >> right
> >> part needed?
> >>
> >>
> >>
> >
> >
>
>
>
04-07-2005, 06:10 PM
#13
Guest
Posts: n/a
Re: Speedometer Recalibration
The trans won't matter at all, and the tcase is the factory fittment.
The difference you are having is the gear ratio in the diffs and the 33"
tires. Having said that, I suppose the tall tires and the 4.56s would cancel
each other out, and the error should be pretty small. The speedo itself can
be dirty inside and this will cause it to be slow. (I didn't say if the
error was + or -.)
"Rusted" <noEmail@please.com> wrote in message
news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
>
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:686dne-eBolYOcjfRVn-vg@ez2.net...
> > The transmission didn't change the speedo calibration, the diff gears
did.
> > I
> > haven't got the link you asked for, but there is one - my guess is that
> > Bill
> > is sending it within the hour.
> >
> > You will need to know the tire diameter and the diff ratio, and this
will
> > drive you to a specific gear size. The gear is easily replaced - find
the
> > speedo cable entering the tcase near the back on the driver's side, and
> > take
> > the single bolt out and remove the gear. Remove the E-clip that holds
the
> > gear on and replace the old gear with the new one. The shaft that the
gear
> > fits onto is on a round plate, but the shaft is off center. You have to
> > turn
> > the plate to align the gear with the gear inside the tcase. There are
> > numbers and guide lines on the plate and the tcase, align the number
that
> > matches the gear count, and you should be good.
> >
> >
> >
> >
> >
> >
> > "Rusted" <noEmail@please.com> wrote in message
> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
> >> Either there is not a lot of info, or I am using the wrong key words to
> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
> >> that
> >> now has a T-18 transmission. Also the gears have been swapped to 4.56.
> > Any
> >> links as to where to look to find the right part or to calculate the
> >> right
> >> part needed?
> >>
> >>
> >>
> >
> >
>
>
>
The difference you are having is the gear ratio in the diffs and the 33"
tires. Having said that, I suppose the tall tires and the 4.56s would cancel
each other out, and the error should be pretty small. The speedo itself can
be dirty inside and this will cause it to be slow. (I didn't say if the
error was + or -.)
"Rusted" <noEmail@please.com> wrote in message
news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
>
>
> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
> news:686dne-eBolYOcjfRVn-vg@ez2.net...
> > The transmission didn't change the speedo calibration, the diff gears
did.
> > I
> > haven't got the link you asked for, but there is one - my guess is that
> > Bill
> > is sending it within the hour.
> >
> > You will need to know the tire diameter and the diff ratio, and this
will
> > drive you to a specific gear size. The gear is easily replaced - find
the
> > speedo cable entering the tcase near the back on the driver's side, and
> > take
> > the single bolt out and remove the gear. Remove the E-clip that holds
the
> > gear on and replace the old gear with the new one. The shaft that the
gear
> > fits onto is on a round plate, but the shaft is off center. You have to
> > turn
> > the plate to align the gear with the gear inside the tcase. There are
> > numbers and guide lines on the plate and the tcase, align the number
that
> > matches the gear count, and you should be good.
> >
> >
> >
> >
> >
> >
> > "Rusted" <noEmail@please.com> wrote in message
> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
> >> Either there is not a lot of info, or I am using the wrong key words to
> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
> >> that
> >> now has a T-18 transmission. Also the gears have been swapped to 4.56.
> > Any
> >> links as to where to look to find the right part or to calculate the
> >> right
> >> part needed?
> >>
> >>
> >>
> >
> >
>
>
>
04-07-2005, 06:45 PM
#14
Guest
Posts: n/a
Re: Speedometer Recalibration
There are actually 2 jeeps with this problem. both CJ's one a 7 one an 8.
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
04-07-2005, 06:45 PM
#15
Guest
Posts: n/a
Re: Speedometer Recalibration
There are actually 2 jeeps with this problem. both CJ's one a 7 one an 8.
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
04-07-2005, 06:45 PM
#16
Guest
Posts: n/a
Re: Speedometer Recalibration
There are actually 2 jeeps with this problem. both CJ's one a 7 one an 8.
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
04-07-2005, 06:45 PM
#17
Guest
Posts: n/a
Re: Speedometer Recalibration
There are actually 2 jeeps with this problem. both CJ's one a 7 one an 8.
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
On the CJ7 it reads around 75 when you are going 65. On the CJ8 it reads
around 40 when going 65 (using the khp chart it comes real close to the
actual speed)
"Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
news:dIydnQxj75mtLcjfRVn-ig@ez2.net...
> The trans won't matter at all, and the tcase is the factory fittment.
>
> The difference you are having is the gear ratio in the diffs and the 33"
> tires. Having said that, I suppose the tall tires and the 4.56s would
> cancel
> each other out, and the error should be pretty small. The speedo itself
> can
> be dirty inside and this will cause it to be slow. (I didn't say if the
> error was + or -.)
>
>
>
>
>
> "Rusted" <noEmail@please.com> wrote in message
> news:ALh5e.7567$eK6.3651@fe43.usenetserver.com...
>> The speedo is WAY off, not just a little bit like gears would do. I am
>> guessing that the "system" Jeep uses, and the "system" that the donor
>> transmission came from were different. Here is the info that I forgot.
>> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33"
>> tires.
>>
>>
>> "Jeff Strickland" <spamcatcher@yahoo.net> wrote in message
>> news:686dne-eBolYOcjfRVn-vg@ez2.net...
>> > The transmission didn't change the speedo calibration, the diff gears
> did.
>> > I
>> > haven't got the link you asked for, but there is one - my guess is that
>> > Bill
>> > is sending it within the hour.
>> >
>> > You will need to know the tire diameter and the diff ratio, and this
> will
>> > drive you to a specific gear size. The gear is easily replaced - find
> the
>> > speedo cable entering the tcase near the back on the driver's side, and
>> > take
>> > the single bolt out and remove the gear. Remove the E-clip that holds
> the
>> > gear on and replace the old gear with the new one. The shaft that the
> gear
>> > fits onto is on a round plate, but the shaft is off center. You have to
>> > turn
>> > the plate to align the gear with the gear inside the tcase. There are
>> > numbers and guide lines on the plate and the tcase, align the number
> that
>> > matches the gear count, and you should be good.
>> >
>> >
>> >
>> >
>> >
>> >
>> > "Rusted" <noEmail@please.com> wrote in message
>> > news:pdh5e.6182$Eq1.970@fe23.usenetserver.com...
>> >> Either there is not a lot of info, or I am using the wrong key words
>> >> to
>
>> >> search with. I am trying to recalibrate the speedometer on a 84 CJ7
>> >> that
>> >> now has a T-18 transmission. Also the gears have been swapped to
>> >> 4.56.
>> > Any
>> >> links as to where to look to find the right part or to calculate the
>> >> right
>> >> part needed?
>> >>
>> >>
>> >>
>> >
>> >
>>
>>
>>
>
>
04-07-2005, 07:15 PM
#18
Guest
Posts: n/a
Re: Speedometer Recalibration
I'm guessing 39 teeth (GREEN 52068061):
http://go.jeep-xj.info/HowtoSpeedoGears.htm Some say the speedometer
gears are the same between the Dana 300 and the puny New Process 231,
all I can find out is there is a short and long shank, and that the
stealership will order the Dana 300 gear. I would give the job to your
local speedometer calibration shop, there's one in every town feed by
people trying to weasel out of their speeding ticket.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rusted wrote:
>
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
http://go.jeep-xj.info/HowtoSpeedoGears.htm Some say the speedometer
gears are the same between the Dana 300 and the puny New Process 231,
all I can find out is there is a short and long shank, and that the
stealership will order the Dana 300 gear. I would give the job to your
local speedometer calibration shop, there's one in every town feed by
people trying to weasel out of their speeding ticket.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rusted wrote:
>
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
04-07-2005, 07:15 PM
#19
Guest
Posts: n/a
Re: Speedometer Recalibration
I'm guessing 39 teeth (GREEN 52068061):
http://go.jeep-xj.info/HowtoSpeedoGears.htm Some say the speedometer
gears are the same between the Dana 300 and the puny New Process 231,
all I can find out is there is a short and long shank, and that the
stealership will order the Dana 300 gear. I would give the job to your
local speedometer calibration shop, there's one in every town feed by
people trying to weasel out of their speeding ticket.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rusted wrote:
>
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
http://go.jeep-xj.info/HowtoSpeedoGears.htm Some say the speedometer
gears are the same between the Dana 300 and the puny New Process 231,
all I can find out is there is a short and long shank, and that the
stealership will order the Dana 300 gear. I would give the job to your
local speedometer calibration shop, there's one in every town feed by
people trying to weasel out of their speeding ticket.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rusted wrote:
>
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
04-07-2005, 07:15 PM
#20
Guest
Posts: n/a
Re: Speedometer Recalibration
I'm guessing 39 teeth (GREEN 52068061):
http://go.jeep-xj.info/HowtoSpeedoGears.htm Some say the speedometer
gears are the same between the Dana 300 and the puny New Process 231,
all I can find out is there is a short and long shank, and that the
stealership will order the Dana 300 gear. I would give the job to your
local speedometer calibration shop, there's one in every town feed by
people trying to weasel out of their speeding ticket.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rusted wrote:
>
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.
http://go.jeep-xj.info/HowtoSpeedoGears.htm Some say the speedometer
gears are the same between the Dana 300 and the puny New Process 231,
all I can find out is there is a short and long shank, and that the
stealership will order the Dana 300 gear. I would give the job to your
local speedometer calibration shop, there's one in every town feed by
people trying to weasel out of their speeding ticket.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Rusted wrote:
>
> The speedo is WAY off, not just a little bit like gears would do. I am
> guessing that the "system" Jeep uses, and the "system" that the donor
> transmission came from were different. Here is the info that I forgot.
> T-18 transmission, D300 t-case (should not matter), 4.56 gears, 33" tires.