The exact differential gear oil your Silverado 1500 takes, plus the fill capacity — anchored to the OEM spec so you don't pour the wrong gear oil.
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Rear differential
Gear oil spec
75W-85 GL-5 (GM Original Equipment, High Efficiency)
GM factory-fill axle lubricant, GM part 19300457, fits Silverado 1500 2014-2024 across the 2.7L, 4.3L, 5.3L, 6.2L gas engines and the 3.0L Duramax diesel. The owner's manual itself prints no spec ('See your dealer') because the rear axle is sourced from two suppliers (AAM and GMCH) in 8.6-in/9.5-in sizes depending on RPO/build.
Spec from the OEM (oem parts, retailer catalog).
Spec anchored to the OEM owner's manual; the capacity, when it carries the verified badge, is cross-checked against an independent source. Never changed by what an affiliate link pays us. Your owner's manual is always the final word — and if your axle has a locker or an option package, double-check the capacity for your exact build.
