GM GENUINE PARTS Rear Axle Housing Cover Gasket 85720902 — OE Fit, Leak‑Resistant Seal

GM Genuine Parts 85720902 is a factory‑validated rear axle housing cover gasket engineered to restore a proper seal on compatible Chevrolet, Buick, GMC, and Cadillac rear differentials.

This rear axle housing cover gasket is an Original Equipment (OE) part from GM Genuine Parts, designed, engineered, and tested to meet the same specifications used in GM production and service. It replaces worn or damaged gaskets to prevent fluid leaks, preserve differential performance, and maintain the integrity of the axle housing. Backed by General Motors, this gasket reflects updated materials and manufacturing practices to match service requirements for select GM models.

How does this gasket restore a leaking rear axle housing?

The 85720902 gasket provides a precise sealing surface between the axle housing and its cover, stopping lubricant seepage and keeping contaminants out. When installed correctly, it recreates the original fit and compressive properties intended by GM engineers, which helps preserve internal component lubrication and reduces the risk of premature wear.

• OE‑specified form and thickness for accurate contact pressure
• Material chosen to resist axle lubricant and temperature cycles
• Fits the original bolt pattern and cover flange dimensions

What vehicles and situations is part 85720902 compatible with?

This gasket is targeted for GM rear axle housings where the original equipment part number corresponds to 85720902. It is intended for use on compatible Chevrolet, Buick, GMC, and Cadillac differentials specified by GM for this part number. Use the vehicle’s VIN or consult a parts catalog to confirm fitment before purchasing.

• OEM replacement for GM service and production applications
• Appropriate for differentials that show gasket deterioration or leakage
• Ideal when performing axle cover service, fluid changes, or repairs

How should I install and maintain the rear axle housing cover gasket?

Installation requires cleaning mating surfaces, removing old gasket material, and seating the new gasket evenly before torquing bolts to GM specifications. Replacing the gasket during axle service or fluid change is standard practice; inspect the cover and flange for warpage or damage and replace parts as needed for a reliable seal.

• Thoroughly clean cover and housing flange prior to installation
• Torque bolts in the recommended sequence and to GM torque values
• Inspect for leaks after service and re‑check torque after a short drive

Why choose GM Genuine Parts rather than a generic gasket?

GM Genuine Parts are validated by General Motors and match the specifications used during vehicle assembly, which reduces the risk of fitment issues and premature failure. These parts benefit from ongoing design updates and material choices that align with GM’s service engineering, ensuring compatibility and performance for the intended application.

• Designed and tested to GM’s engineering standards
• Backed by the manufacturer that designed the vehicle components
• May have previously been listed under ACDelco GM Original Equipment (OE)

Who is this for? This gasket is for technicians, DIYers, and fleet managers working on Chevrolet, Buick, GMC, or Cadillac rear differentials who want an exact OE replacement. Choose part 85720902 when you need a reliable, factory‑validated seal during differential service, cover replacement, or when correcting axle housing leaks to maintain vehicle safety and performance.