Hello. Trying to figure out the gear ratio in my suburban. Just purchased it. The rear end is out. Wanting to get a used one to swap it. Dont have the info in the glove box. The vehicle isnt at my house yet. Here is my VIN 3GKFK16R0XG552222. It's a 99 4x4 GMC suburban. Can anyone help? Thank you!

 

Couldn't find it with the VIN. Here are some GM axle ratios:

GK9 Rear Axle: 4.63 Ratio

GTY Axle Wide Track

GT4 Rear Axle: 3.73 Ratio

GT5 Rear Axle: 4.10 Ratio

GU4 Rear Axle: 3.08 Ratio

GU6 Rear Axle: 3.42 Ratio

G80 Rear Axle: Positraction

HC4 Rear Axle: 4.56 Ratio

HC7 Rear Axle: 5.13 Ratio

Chances are that you have a 3.08/3.42/3.73/ or 4.10 ratios. Simple way, assuming the axle doesn't have tag on i'd is to mark your and driveshaft and tire with crayon or white out

Count revolution of driveshaft as tire meets the beginning first rotation, Divide that number in get your axle ratio.

 

i made a chart up a few years ago like Henry talked about
How to determine what ratio you have without removing the cover

 

Good advice Irish Alley!

 

thank you, to you also