GM 9.5 14 Bolt Differential Cover – Patterned Fins – Heavy Duty Aluminum Upgrade

Enhance the performance and protection of your drivetrain with this GM 9.5 14 Bolt Differential Cover with Patterned Fins, designed to deliver improved cooling and durability under demanding conditions. The patterned fin design increases surface area for enhanced heat dissipation, helping maintain optimal differential temperatures during towing, hauling, and off-road use.

Constructed from high-quality aluminum, this differential cover provides superior strength compared to factory stamped covers while offering added protection for internal components. The unique fin pattern not only improves cooling efficiency but also adds a bold, performance-inspired appearance.

Engineered as a direct-fit replacement for GM 9.5 14 bolt differentials, this cover ensures dependable fitment, secure sealing, and long-lasting reliability.

✅ Key Features:

• Fits GM 9.5 14 bolt differentials
• Patterned fin design for enhanced heat dissipation
• Heavy-duty aluminum construction for strength and durability
• Provides added protection for internal components
• Ideal for towing, off-road, and heavy-duty applications
• Direct fit for easy installation and leak-free sealing

Upgrade your differential with confidence and enjoy improved cooling, enhanced durability, and long-lasting performance.

Volume: 1.0 quart over stock

Dimensions: Click here for dimensions. 

Number of Bolts: 14 bolts, see Guidelines for Bolt Sizes (click here), opens in new tab or window

PML makes three covers for the GM 9.5 inch ring gear differential. All three fit the differential. This PML part is designed for GM and Chevy trucks and SUVs looking for an extra capacity differential cover that is only 1/2 inch deeper than stock to clear most spare tires.

Benefits:

• 1 quart of extra fluid capacity
• Drain hole and magnetic drain plug to simplify maintenance
• Fins for heat dissipation and a custom look
• Sand cast aluminum construction for thick walls
• Machined gasket flange for a secure seal
• Slightly deeper than stock for clearance

Applications:

These PML rear end differential covers fit the 14 bolt GM 9.5 inch rear differential. Some possible applications are:

• 1/2 Ton Trucks, 1988 to 2013:
  • C10 & K10
  • C1500 & K1500
  • Silverado 1500 & Sierra 1500
  • Silverado 1500 SS
  • Silverado 1500HD & Sierra 1500HD
• 3/4 Ton Trucks, 1979 to 2004:
  • Avalanche 2500
  • C20 & K20
  • C2500 & K2500
  • Silverado 2500 & Sierra 2500 (not HD)
• 3/4 Ton Vans, 1981 to 2013:
  • Vandura
  • Express
  • Savana
  • G2500
• 1 Ton Vans, 1982 to 1995:
  • Vandura
  • Savana
  • G3500
• SUVs such as:
  • Suburban 2500
  • Blazer K5
• These vehicles usually need PML GM 9.5 H2 cover because of the sway bar:
  • Hummer H2
  • Trailblazer SS
  • SSR
  • Escalade

Bolt Information

GM has used four different bolts for this differential. See Guidelines for Bolt Sizes (click here), opens in new tab or window

Optional Temperature Sensor Port

The boss on the side can optionally be machined for temperature sending unit. There is a machining charge and a plug is included.

Matching Front Cover for 4WD

PML makes a matching differential cover for the GM Front 8.5, 10 Bolt.

Gasket Information

PML recommends RTV or paper/fiber gaskets or cork composite gaskets.

PML machines the gasket surface of our differential covers flat. The flange surface of the differential housing is also machined flat. A thin bead of RTV silicon sealant makes an excellent seal between two machined surfaces.

Fill and Level Check

The fill hole is on the side of the cover at the same level as the stock cover. The level check hole is on the differential housing. Fill and check the fluid level with this PML cover just like with the stock cover.

PML Differential Cover Compared to Stock

   
Click on image to view larger in a new tab or window.

This image compares the depth of all PML GM 9 1/2, 14 bolt differential covers and the stock cover. Click on image to view larger in a new tab or window.