2020-2026 Duramax 3.0L PPE 9.5" SU8 12-Bolt Heavy-Duty Cast Aluminum Rear Differential Cover (1380514X0)
PPE's heavy-duty rear differential cover is built for the AAM 9.5" 12-bolt rear axle with RPO build code SU8, found under 2020-2026 GM 1500 trucks including the 3.0L Duramax. It is cast from heat-treated A356.0-T6 aluminum, adds 0.57 quart of fluid capacity, and uses half-inch external cooling fins to pull heat out of the gear oil so it holds its viscosity when you tow or haul.
Inside, precision-placed windage scrapers keep fluid flowing over the gears without excess churning, which cuts heat buildup, aeration and parasitic loss. The internal scrapers and external fins form a cross-braced structure, and cast-in gussets add support at the housing flange. The fill plug sits at the factory fill height, and both 304 stainless service plugs carry a high-temperature neodymium magnet to catch ferrous wear particles.
- Heat-treated A356.0-T6 cast aluminum, strong and thermally conductive
- Precision-cast in permanent steel molds for a smooth, consistent finish and accurate fit
- Adds 0.57 quart of fluid capacity for more thermal headroom
- Half-inch external fins improve heat dissipation and impact resistance
- Internal windage scrapers reduce churning, heat, fluid aeration and power loss
- Fins and scrapers combine into a cross-braced structure
- Cast-in gussets support the differential housing flange
- 304 stainless drain and fill plugs with neodymium magnets and Viton O-rings
- Available in Raw, Brushed and Black finishes
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