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you can check you RPO codes(specific vehicle options)
The RPO code list will either be inside your center console or in the drivers side trunk storage compartment. You will have one of the following:
GH3 : AXLE REAR, 2.77 RATIO
GW6 : AXLE REAR, 3.27 RATIO
GM3 : AXLE REAR, 3.45 RATIO
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