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GM 10.5 Straight Fins
    GM 10.5 Straight Fins
    Purchase GM 10.5 Straight Fins
    • GM 10.5 Straight Fins
      Part Number: dc-asm-6060

    • Cover includes magnetic drain plug and mounting hardware. If brackets for the brake line attached to the stock cover, contact PML for longer bolts.

      Price varies with finish.


      Shipping Weight: 10.00 pounds

    • Stock Bolt Size (choose one, see Specifications for more info):

    Number of Bolts: 14 bolts, see Specifications for Bolt Size Guidelines

    Volume: 1.0 quart over stock, approximately

    Dimensions: Click here for dimensions.

    This differential cover fits heavy duty trucks, SUVs, and vans such as Chevy and GMC 2500 and 3500, with the GM 10.5 inch (10½$quot;) ring gear.

    PML makes two different rear end covers for the GM 10.5 differential: this one and part number 9369, which has a patterned fin design and more clearance.


    • Extra capacity
    • Drain hole and magnetic drain plug to simplify maintenance
    • Large, straight fins for heat dissipation and classic styling
    • Sand cast aluminum construction for thick walls
    • Machined gasket flange for a secure seal
    • Round shape similar to profile of stock cover

    Bolts: Check and order the correct mounting bolts. These differentials were made with 3/8 inch (0.375 inch) and 8 mm (0.315 inch) diameter bolt threads. PML offers the cover in both versions. They are not interchangeble.

    This PML cover fits the GM 10.5 inch ring gear differential. 14 bolts secure the cover to the housing.

    Typical applications include the following. Be aware that for each model and year there may be more than one rear axle possible so please check before ordering.

    • 3/4 Ton Trucks, 1973 to 2016:
      • C20 & K20
      • C2500 & K2500
      • Silverado 2500 & 2500HD
      • Sierra 2500 & 2500HD
      • Suburban 2500
    • 1 Ton Trucks, 1973 to 2016:
      • C30 & K30
      • C3500 & K3500
      • Silverado 3500 & Sierra 3500
    • 3/4 Ton Vans, 1973 to 2016:
      • Vandura
      • Express
      • Savana
      • G20
      • G2500

    Vehicle configurations vary. Check clearance and verify differential before ordering. There is a restocking fee for returns.

    Vehicles with towing packages may have limited space for a larger differential cover. Also, the spare tire may be close to the cover. Some folks have increased the space by tying the spare tire back.

    From about 2003 on, GM switched to the AAM 11.5 inch ring gear differential on most diesel engine vehicles.

    Other possible differentials would be GM 9.5 or GM AAM 11.5 inch ring gear.

    Bolt Size Guidelines

    GM used two different bolts on this differential: standard (3/8 inch) bolts and metric (8 mm) bolts

    To determine which bolts to order, you can remove a stock bolt (a top bolt is best) and measure the diameter of the thread.

    • Threads on an 8 mm bolt will have a diameter of 8 mm or 0.315 inch (5/16 inch)
    • Threads on an 3/8 inch bolt will have a diameter of about 10 mm or 0.375 inch (3/8 inch)

    The cover is machined with bolt holes for the specified bolt size. So specifying the correct bolts is important. They are not interchangeble.

    PML supplies new mounting bolts with each cover. The stock bolts will not work with the PML cover because the PML cover is heavy duty so the flange is much thicker.

    Matching Front Cover for 4WD

    For 1991 and older 4WD trucks and SUVs, the front differential is usually the GM Front 8.5 and PML does make a cover for that.

    PML Differential Cover Compared to Stock

    PML Differential Cover Part Number 6060 compared to stock   PML Differential Cover Part Number 6060, compared to stock, top view
    Click on image to view larger in a new tab or window.

    This image compares the depth of both PML GM 10 1/2 inch 14 bolt rear differential covers and the stock cover. Click on image to view larger in a new tab or window.
    PML GM 10 1/2 Differential Covers depth comparisons