GM 10 Bolt 8.2/8.5 Alum Rear Cover

The MOSER ENGINEERING GM 10 Bolt 8.2/8.5 Aluminum Rear Cover is a performance-grade differential cover engineered for General Motors 10-bolt rear axles in the 8.2 and 8.5-inch configurations. Cast from aerospace-grade aluminum, this cover delivers superior heat dissipation compared to cast iron, keeping differential fluid temperatures within optimal operating range during sustained driving, towing, or competition use. The natural aluminum finish provides corrosion resistance while maintaining a clean, professional appearance under the vehicle.

Engineered by MOSER ENGINEERING, a recognized leader in differential performance components, this cover measures 12.4 x 4.75 x 12.5 inches and weighs 9.57 lbs—a significant weight reduction over factory cast-iron units. The lightweight design contributes to improved vehicle dynamics and reduced unsprung weight on performance builds. Installation is straightforward: gasket and mounting hardware are included, eliminating the need for separate component sourcing. The precision-machined aluminum construction ensures proper sealing and fitment to OEM mounting points, with no modification required for direct bolt-on installation.

This cover is essential for builders prioritizing thermal management, weight reduction, and long-term durability in street performance, off-road, or track applications. Whether managing heat from sustained highway driving, towing loads, or high-output engine builds, the aluminum construction outperforms OEM covers. The GM 8.2 and 8.5 10-bolt rear axle is common in trucks, SUVs, and performance vehicles from the 1960s through early 2000s, making this MOSER ENGINEERING differential cover compatible with a broad range of GM platforms. Buyers upgrading cooling or reducing vehicle weight for handling and efficiency gains will find this a cost-effective, OEM-fitment solution backed by a brand trusted in the performance automotive community.