2003 Tahoe Gear ratio?

[Nestorxg]

I have a 2003 Tahoe. I'm not sure what the gear ratio is. I swapped the differential once so RPO codes are no use. The original code is GT4. The donor car is long gone. It's on 32" tires. I want to use bluecat to tune the transmission. What could the gear ratio be?

I raised the rear end and rotated the tire to try to identify the ratio. For two tire rotations the drive shaft turned about 2 1/2 or 2 3/4 times. I think this means the ratio is 2.xx something ish.

The transmission is 4l60e.

[blindsquirrel]

Just pull the cover and get it over with, count the teeth or read the markings on the ring gear.

[5FDP]

I think you'll want to re-try that and see what your results are.

The Tahoe axle would have 3.23, 3.42 or 3.73's as far as I know from the factory.

If you have a G80 rear axle, do it really slow and only have 1 wheel off the ground. You don't want the locker to engage while you spin it.

[Nestorxg]

Just pull the cover and get it over with, count the teeth or read the markings on the ring gear.

I will need to do this, just haven't had the time. Thanks.

[Nestorxg]

Thanks for the quick response. I wasn't confident I did it right. I'm just going to make time and pull the cover. I've had transmission problems before and I think the trans tune is part of the problem.

[TheMechanic]

I just jack up the rear put a zip tie on the driveshaft and have two people make exactly one full revolution of the tire and count how many times the driveshaft rotates. Takes under 5 minutes if you are slow