Odometer roll back warning

[bison]

According to the guy I bought this from, the speedo was calibrated for a 3.42 rear and a 200-4R trans....for a typical GN. So I'm hoping now that the speedo will still read right and the odometer will work also.

The trans gearing itself has nothing to do with the speedo reading. It is/was based on a 3.42 rear gear with 26" tires. If you have taller or shorter (measured, not sidewall math) then the speedo/odometer will be off by the % difference in gear and tire height. 10 % taller tire and the speedo odometer is off 10%. If you want to get the correct driven and drive gear combo you can go on one of the many calculators on the internet or calculate how many tire revs per mile and work backward to get the speedo ratio needed.

 

["Turbo-T"]

Bison, just stating in verbatim the words of the seller...but thanks for the input.

Good news....all checks out well.

The speedo is almost accurate. I compared it to my Scanmaster and it's pretty close. Not dead nuts on but close. (hopefully the Scanmaster was reading right on)

The swapped over odometer and tripometer work great too in their new homes. So it seems my transplant has done well.

 

[whitecobra98]

ive got mine apart to replace the speedo unit with a 145, but am stuck...i cant get the aluminum center out to put the new unit in...help!!!!!!!!!!!!!