Ive been searching everywhere for several hours, and cant find any part numbers for what I need. No stores or dealers have a clue. I need speedo gears for my M39 T-5, 3.73, and 275/40/17 tires. The calculator at http://www.hanlonmotorsports.com/t5speedo.asp says I need 6/18 or 7/21. They don't make a 6 tooth drive gear do they? I thought it was just 7 and 9. Any help is greatly appreicated

 

anybody?

 

7/21 sounds believable. That's the stock combo for 3.73 IIRC, i.e. whats in my car.

Search this forum for my userID and the phrase "SMUC", and learn how to calculate what you need yourself.

Can't help you with part #s. Sounds to me like you need to find a dealer with more educated people behind the counter. I don't ever have any trouble coming up with them when I need them. They definitely exist.

 

i found one

http://www.chgoautopts.com/

part #14090594, it comes with the sleeve, so its a little bit more $, but i got one

 

be carefull you don't get a ford set the ford drive gear rotates the other way, at least when compared to the electronic spedo set in a '92

Ryan

 

no, thats a gm number. i got it today, its 29 years old, in original packaging, so i assume that same style must have been used in t-10s?