Details

• Brand:

  

• SKU:

  85720902

• Positions: Rear
• Other Names:

  Gasket

• Description:

  🔧 GM Part #85720902 — what it is

  GM Genuine Parts 85720902 Rear Axle Housing Cover Gasket

  • Official name: Rear Axle Housing Cover Gasket
  • Also listed as: GASKET-R/AXL HSG CVR
  • System: Rear differential / axle assembly
  • Position: Rear axle cover
  • Type: OEM GM / ACDelco molded gasket

  ⚙️ What it does

  This gasket seals the rear differential cover to the axle housing.

  It:

  • Keeps gear oil inside the differential
  • Prevents:
    • Fluid leaks
    • Dirt/water contamination
  • Helps protect:
    • Ring & pinion gears
    • Bearings
    • Limited-slip components

  👉 Basically, it’s the seal between the rear diff cover and axle housing.

  🚗 Common fitment

  Used on many 2014–2025 GM trucks and SUVs, including:

  • Chevrolet Silverado 1500
  • GMC Sierra 1500
  • Tahoe / Yukon / Escalade
  • Some newer half-ton GM trucks with:
    • 9.5" axle
    • 9.75" axle
    • 10.5" axle assemblies

  Common engines include:

  • 2.7L Turbo
  • 3.0L Duramax
  • 4.3L V6
  • 5.3L V8
  • 6.2L V8

  🔁 Replaces

  • 22943110

  ⚠️ Important notes

  • Must match your axle code / axle size
  • Usually replaced when:
    • Changing diff fluid
    • Removing differential cover
    • Fixing leaks
  • Much cleaner and easier than using RTV alone

  🔧 Replacement notes

  When servicing the rear diff:

  • Clean both sealing surfaces thoroughly
  • Inspect cover for warping/rust
  • Refill with correct gear oil after install

  Torque specs matter — overtightening can distort the cover and cause leaks.

  👍 Bottom line

  • 85720902 = rear differential cover gasket
  • Used on many 2014+ GM trucks/SUVs
  • Seals the rear axle housing and prevents gear oil leaks

  
  

  Genuine GM OEM Cover Gasket (MPN: 85720902) for Chevrolet Silverado and GMC Sierra trucks equipped with 9.50 ring gear and 12-bolt differentials. This factory differential cover gasket creates a reliable seal between the differential cover and housing, preventing fluid leaks and maintaining proper lubrication. Essential for differential maintenance and repair on select GM full-size pickup trucks.

  - Differential cover gasket designed for 12-bolt rear axle assemblies with 9.50 ring gear applications
  - OEM fitment for Chevrolet Silverado and GMC Sierra trucks requiring differential service
  - Factory gasket prevents differential fluid leakage and maintains transmission fluid integrity
  - Compatible with GM 12-bolt differential cover assemblies for pickup truck models
  - Genuine OEM part in new condition, direct replacement for original equipment

• Notes: Part included axle assembly. Included with axle assembly. Order by axle code.
• Applications: 9.50, 9.75 & 10.50.
• Replaces:

  22943110

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