How to change the rear differential oil on a 2019-2023 GM 1500 chassis, including Sierra, Silverado, Suburban, Tahoe, and Yukon. There are two production options (RPO's), SU7 and SU8. The SU7 is manufactured for GM by American Axles & Manufacturing (AAM), while the SU8 is produced by GM. This video showcases the service procedure while highlighting differences in axle identification, part numbers, fluid types, and capacities.