This should be so easy but I think I am missing something.

When my pinion seal blew, I dissassembled my rear-end and discovered that I had a 3.42 open with 26 spline axles in a axle from an '89. Strange seeing that I am supposed to have 2.73, 28 spline open rear and I am the 3rd owner of this car (neither of the 2 previous owners know anything about a rear end swap and the 1st owner bought it at the dealership).

Anyway, I had 3.23's installed and I need to swap speedo gears.

All the calculators need to know your drive or driven gear teeth number to calculate the other. The truth is that I dont know either.

I am riding on 245/50/16's.

Whats the solution????????

 

Remove the speedo cover and see what color either gear is (drive or driven) - they are color coded - then you can get the other gear calculated. Tilt the car up from the rear to reduce the fluid loss.

 

Do you have to know what one or the other is first? Or was there a standard drive or driven gear used on all gm f-bodies?

 

take a look around this site

700R4, 700R4 Speedometer Gears, 4L60, 700R4 Speedometer Calibrations, 700R4 !