Gear Ratio?

[MikeD.]

Hey guys.. I just bought an 08 LTZ and I was wondering how I might be able to check if I have 3.73's or 4.10's- w/o having to call the dealership with my tail between my legs- any websites I might be able to do a VIN check on?

 

[zora]

with the rear of the vehicle jacked up, and in neutral with parking brake off, put a mark on the driveshaft and turn one of the rear tires one complete revolution while counting the number of times the driveshaft rotates. If it's 3 3/4 turns you have the 3.73, slightly over 4, the 4.1

 

[MikeD.]

Thanks man..