[krazyshane]

Someone said for info on the rear end of your truck etc, go to s-series.org, and enter your rpo codes. Thats fine, but how do you know your rpo code?

 

[xtremer-pxl]

the codes for your truck are in your glove box!

 

[DoubleDown]

GU4=3.08
GU5=3.23
GU6=3.42
GT4=3.73
GT5=4.10
HC4=4.56

G80 - locking differential