Hey guys i need your help!!! i have an '85 camaro with the 700r4 and just a little while ago i put in a posi unit with 3.73 gears. I had a "one legger" with 3.08. Anyways now that i have the bigger gears my speedometer is off by +10mph. I was told that i need a speedo gear that goes in the end of the tailshaft of my tranny. Anyways my questions was that they said i need to figure out how many teeth the gear has. Well i dont have time to take it out and look at it since the car is my daily driver. Does anyone know how many teeth it has and/or which one i need to get to have the correct speed with my 3.73 gears. I really appreciate the help! thanks!!!!!!!

 

https://www.thirdgen.org/newdesign/faq/thirdgen.shtml

It took me a while to figure the whole thing out. Bear in mind there are TWO gears, not one, and you have to match them up to get the proper ratio to match your rearend. There are also different size carriers that the driveshaft gear sits on....i think everything under a 45 tooth gear takes one carrier but the 45 uses the different one.

 

<A HREF=http://members.shaw.ca/crussel/speedo.exe">Try this</A>