SPEEDOMETER PINION.
Posted: Tue Nov 17, 2015 8:31 am
Hookay - here's the sitchuation. My GPS says 65 MPH and my speedometer says 80 MPH. With a little research in the parts book I found out with a 3:31 to 1 differential you need a 20 tooth pinion part # 1636409. I removed the pinion housing from the tranny and found I have a 17 tooth pinion in the car and thats for a 2:93 to 1 differential. The red pinion you see in the picture is also a 17 tooth I got on ebay years ago. I reached out to FATSCO for help and they are checking to see if they have a 20 tooth pinion.
Meanwhile after trying without breaking anything and visiting a couple tranny shops I can't figure out how to remove the pinion from the housing. Note on the end that drives the speedometer cable there seems to be a plastic piece that the pinion shaft with the tapered end fits into. I assume there is something on the inside of the housing that holds the pinion in the housing so it doesn't come out when in the tranny. I hope the pictures help.
Dick.
Meanwhile after trying without breaking anything and visiting a couple tranny shops I can't figure out how to remove the pinion from the housing. Note on the end that drives the speedometer cable there seems to be a plastic piece that the pinion shaft with the tapered end fits into. I assume there is something on the inside of the housing that holds the pinion in the housing so it doesn't come out when in the tranny. I hope the pictures help.
Dick.