I currently have the stock speedo gear which had (2:73 gears) in my (700R4)transmission now. I want to install the right speedo gear with (3:42 Gears), so my speedometer is accurate. Does anybody know how many teeth i need on the speedo gear.

 

I did a search and found a formula for this. The website is http://www.sallee-chevrolet.com/Chev...tallation.html But i know there is somebody with a auto that has added 3:42 gears.

 

Yes but they have so many different size tires on our cars no one gear set is coorect. www.700r4.com has a calculator that can help you, they also sell the parts.

 

Thanks SSC i will try that site.

 

you will also need to know what driving gear you have on the output shft. they are color coded.

 

i used a 45 tooth driven gear (biggest GM makes) so i didnt have to dig inside the tranny..............the end result is close enough (off by like 3%)

 

what size tires do you have, tell me that and i can tell ya what gears you need (part numbers and tooth count)

 

If you have the factory size tires on the 16" rims use the 15T and the 41T. That's what I have for my 3.42's...

 

Thanks guys for the help. Looks like my problem is solved. My tire size is 245-50-16.

 

ok you need
15t gray drive gear p/n 8642620
and 41t yellow driven gear p/n is 25513048 for an electric speed sensor, and p/n 1362195 for a cable drive (sorry didnt know which one you have)

 

Thanks 92GTA and 90IROC5SPD for the exact teeth amount