• GM 84412728 Genuine Rear Axle Housing Cover Gasket
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GM 84412728 Genuine Rear Axle Housing Cover Gasket

GM 84412728 Genuine Rear Axle Housing Cover Gasket

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✔ GM Genuine Parts 84412728 Rear Axle Housing Cover Gasket — Genuine OEM Part
✔ Fitment: Select 2019–2026 Chevrolet Silverado 1500 and GMC Sierra 1500 models with 9.50" or 9.76" ring gear (Supplier B) — See Fitment Table for full details
✔ Direct replacement for factory differential cover gasket — no modifications required
✔ Manufactured to GM’s original specifications — Fiber type with inner lip seal
✔ Genuine OEM quality — seals between the differential cover and housing to prevent leaks
✔ Other Names: Differential Cover Gasket

 

GM Genuine Parts 84412728 Rear Axle Housing Cover Gasket — for Select GM Trucks

Gear oil leaks from the rear differential cover, visible fluid stains on the underside of the axle housing, or a low differential fluid level — these are common signs that your rear axle housing cover gasket is failing. This gasket creates a fluid-tight seal between the differential cover and the axle housing, preventing gear oil from leaking out and contaminants from entering. A worn or damaged gasket can lead to fluid loss, differential damage, and costly repairs. Replacing it with this genuine GM part restores a proper seal and protects your drivetrain.

This is a factory-original GM rear axle housing cover gasket (OE part number 84412728). It is a fiber-type gasket with a lip seal on the inside, designed specifically for 9.50" and 9.76" ring gear differentials with Supplier B specification . This is the same part sold at GM dealerships.

 

When to Replace

• Gear oil leaks from the rear differential cover
• Visible fluid stains on the axle housing or underneath the vehicle
• Low differential fluid level
• Contaminated gear oil (water or debris intrusion)
• Differential cover removal for service or gear change

Product Details & Highlights

• ✔ Genuine GM OEM — not an aftermarket or Chinese replica
• ✔ Direct replacement — fits factory differential cover
• ✔ Fiber construction with lip seal — provides reliable sealing • ✔ Prevents fluid leaks — protects differential from damage
• ✔ Manufactured to GM’s strict quality standards
• ✔ Backed by GM’s manufacturer warranty (minimum 12 months)

Package Contents

• 1 × GM Genuine Parts 84412728 rear axle housing cover gasket

FAQ

FAQ

Is this a genuine GM part or a copy?
This is 100% genuine GM OEM — in original factory packaging with the GM part number printed on the label. It is not an aftermarket brand or a replica .

Does this fit my 2022 Chevrolet Silverado 1500?
Yes — the 2022 Silverado 1500 with 9.50" or 9.76" ring gear and Supplier B differential uses this gasket. We recommend verifying with your VIN .

Does this fit my 2023 GMC Sierra 1500?
Yes — the 2023 Sierra 1500 with the correct differential specification is listed as compatible. Please verify with your VIN .

What is the difference between SU7 and SU8 gaskets?
The SU8 differential uses this gasket (84412728), which is a fiber type with a lip seal on the inside. The SU7 differential uses a different gasket. Both are 12-bolt .

Can I reuse this gasket?
This gasket is designed for single-use application. It should be replaced whenever the differential cover is removed. Unlike rubber reusable gaskets, this fiber gasket is not designed for multiple installations .

Can I install this gasket myself?
Yes — it is a direct replacement. The differential cover must be removed, the old gasket cleaned off, and the new gasket installed with the cover. Gear oil must be refilled to the correct level. We recommend consulting your vehicle's service manual for the correct procedure and torque specifications.

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