How can you tell which rear end gearing you have, without spinning a tire and drive shaft.
I have an 02 Z with 285/75/16s turning right at 1500 RPM at 60 and an 06 Yukon 4x4 with 265/70/16 turning right at 2000RPM ar 62?
I thought it was in the VIN, but I can't find anything telling which character it is in the series

thanks

 

Check the glove box for a G code.

http://autorepair.about.com/library/...bl574a-lib.htm

 

if its not in the glove box where else can you find it?

 

newer trucks are in the glove box but I had a 2000 that had it in the center console.

 

Thanks for the assist. It's in the glove box and it looks like my wife has a Yukon spinning 4:10 gears.