B&M Hi-Tek Aluminum Differential Cover (70504) - GM 8.875-Inch 12-Bolt Truck
Protect your differential while improving strength and cooling with the B&M Hi-Tek Aluminum Differential Cover for GM 8.875-inch 12-bolt truck axles. Engineered to outperform the factory stamped steel cover, this premium upgrade is built from high-strength A356.0-T6 aluminum to better dissipate heat and help maintain lower differential fluid temperatures during towing, off-road use, performance driving, or heavy-duty workloads. It's the perfect solution for truck owners looking to increase durability and extend the life of their drivetrain.
Beyond improved cooling, the Hi-Tek Differential Cover is reinforced where it matters most. Integrated load bolts help reduce bearing cap deflection under extreme loads, while a reinforced center bar adds structural rigidity to the housing. The smooth internal contour promotes proper gear oil circulation over the ring gear and bearings for consistent lubrication. A magnetic drain plug simplifies routine maintenance by capturing harmful metal particles, and the additional half-quart fluid capacity provides even greater protection under demanding conditions. Backed by over 65 years of B&M engineering and a Lifetime Limited Warranty, this cover is built for long-lasting performance.
Features
- Fits GM 8.875-inch 12-bolt truck differentials
- Constructed from durable A356.0-T6 cast aluminum
- Dissipates heat more efficiently than the factory stamped steel cover
- Integrated load bolts help minimize bearing cap deflection under heavy loads
- Reinforced center bar increases housing strength and rigidity
- Smooth internal design promotes proper gear oil flow and lubrication
- Magnetic drain plug captures ferrous metal particles for easier maintenance
- Increases differential fluid capacity by approximately 0.50 quart
- Machined B&M logo for a premium appearance
- Includes installation hardware and detailed instructions
- Backed by a Lifetime Limited Warranty
Performance Benefits
The B&M Hi-Tek Differential Cover is designed to improve both durability and reliability under demanding conditions. Its aluminum construction transfers heat more efficiently than the factory steel cover, helping maintain lower operating temperatures during towing, hauling, racing, and off-road use. Combined with reinforced load bolts and increased fluid capacity, this cover helps protect the differential from excessive wear while improving long-term performance.
Important Notes
- Fits GM 8.875-inch 12-bolt truck rear differentials only.
- Gasket is not included and must be purchased separately if required.
- Includes magnetic drain plug, mounting hardware, and installation instructions.
Fitment
Fits GM trucks equipped with the 8.875-inch 12-bolt rear differential.
Please verify your axle before ordering to ensure proper fitment.
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
