What kind of oil goes in the rear end a gm truck 2005?

A 2005 GM truck's rear differential requires 75W-90 gear oil. However, it's crucial to check your owner's manual. Some trucks, depending on the axle type (e.g., limited slip), may specify a different viscosity or type of gear oil (such as synthetic or one with limited-slip additives). Always use the oil recommended by the manufacturer for optimal performance and longevity of your rear differential.