Speedometer Recalibration
 

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?

Re: Speedometer Recalibration
 

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?
>
>
>

Re: Speedometer Recalibration
 

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?
>
>
>

Re: Speedometer Recalibration
 

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?
>
>
>

Re: Speedometer Recalibration
 

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?
>
>
>

Re: Speedometer Recalibration
 

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?
>>
>>
>>
>
>

Re: Speedometer Recalibration
 

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?
>>
>>
>>
>
>

Re: Speedometer Recalibration
 

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?
>>
>>
>>
>
>

Re: Speedometer Recalibration
 

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?
>>
>>
>>
>
>

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?
> >>
> >>
> >>
> >
> >
>
>
>