Larrys T/A

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.

Larrys T/A

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.

SSC

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.

Larrys T/A

Thanks SSC i will try that site.

jeffs82z28

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

v8unleashed

iTrader: (3)

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%)

90iroc5spd

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

92GTA

iTrader: (11)

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...

Larrys T/A

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

90iroc5spd

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)

Larrys T/A

Thanks 92GTA and 90IROC5SPD for the exact teeth amount