Im ready to buy a set of 3.73s but i need to know how to correct my speedo before i get them, i have heard that i can change the gears in the speedo to fix it, but how do i find out what speedo gears to get with 3.73s and 17 inch rims?

 

For A4 cars you can change the gears. I can't help you with the part numbers though.

Ben

 

As said above, if it's an A4 car:

The gears that are swapped out in the A4 93 700R4(4L60) trannies are called the drive and driven gears. The correct GM part numbers for a numerically correct drive/driven gear teeth count to offset the 3.73:1 ring and pinion are as follows:


GM p/n 25513052 (44 tooth driven gear) $12.78

GM p/n 8642620 (15 tooth drive gear) $7.56

(I pulled the above information from the speed density LT1 forum)

IF it's a M6 car, you're SOL except for one option. An SLP speedo recalibration box, which they don't make anymore. You've got to find one.

 

A friend of mine has a 93 Formula with an A4 and needs to correct for a 3.42 gear. Do you know the part numbers for those? I searched the LT1 speed density forum like you suggested, but I am not really familiar with the site and couldn't find anything. Thanks ahead of time.

 

Well, that speed density board you checked is dead because we JUST made a move over there.

I don't know the part number, but let me ask a couple of people and I'll get back to ya.