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axle size

  1. 10.5" or 11.5" Rear Axle?

    Hi all! Okay, how do you tell what size the rear axle is? It is a 2002 2500HD Duramax with axle rpo's GT4 & G80. Left rear axle seal is leaking so I tried to order parts today from the DEALER, gave him the VIN and he asked ME what size the rear axle is... WHAT? If anyone should know...