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GM 9.5 14 Bolt, Patterned Fins
    GM 9.5 14 Bolt, Patterned Fins
    Purchase GM 9.5 14 Bolt, Patterned Fins
    • GM 9.5 14 Bolt, Patterned Fins
      Part Number 9504

    • Cover includes magnetic drain plug and mounting hardware.
      Price varies with finish. SEE PRODUCT INFO.


    • Stock Bolt Size (choose one, see Specifications for more info):
      OPTIONAL - add machining of a 1/8 NPT hole for an aftermarket temperature sending unit:

    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.


    • 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

    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

    Configurations vary. Always check your vehicle to verify differential and clearance. For each model and year there may be more than one rear axle possible. Check your stock cover shape and number of bolts. Check for space to spare tires, pan hard and sway bars, and similar, and see Installations for examples.

    2014 and newer Silverado and Sierra 1500: please see PML GM 9.5 12 bolt cover.

    2010 GMC 1500 Denali

    Leon's Transmissions in Garden Grove, 714-534-3300, installed a black powder coated differential cover on a 2010 GMC 1500 Denali. They also installed one of our new 6L80 transmission pans on the truck.
    GMC 1500 Denali with a PML differential cover, extra capacity    PML differential cover getting installed on a 1500 Denali    PML differential cover installed on a GMC 1500 Denali, tire spacing
    Click on an image to view larger in a separate tab or window.

    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

    PML Differential Cover Part Number 9504 compared to stock   PML Differential Cover Part Number 9504, compared to stock, top view
    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.
    PML GM 14 bolt differential covers depth comparisons

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