How do you service the rear differential on an 05 Buick rendezvous?

To service the rear differential on a 2005 Buick Rendezvous, start by lifting the vehicle and securely supporting it on jack stands. Remove the rear differential cover to drain the old fluid, and clean the mating surfaces thoroughly. Replace the seal or gasket, then refill the differential with the appropriate type and amount of gear oil as specified in the owner’s manual. Finally, reattach the cover, ensuring all bolts are tightened to the specified torque.