Rear end gearing

corky

Original poster
Member
Jan 23, 2012
77
Portland OR
What's the best way to determine or find out what gearing I have, it's an 03 ltz with a towing package if that helps at all,
 

Matt

Member
Dec 2, 2011
4,019
Look in the glovebox for the RPO codes.

G80 Differential, locking, heavy-duty, rear
GT4 Rear axle, 3.73 ratio
GT5 Rear axle, 4.10 ratio
GU6 Rear axle, 3.42 ratio
 

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