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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. SEE PRODUCT INFO.

      $0.00

    • 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.

    Benefits:

    • 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.

    2016 Silverado 2500HD

    This differential cover was installed by BOOSTPOWER.com on a 2016 Silveardo 2500HD.

    2016 Chevy Silverado 2500 with PML rear differential cover installed PML differential cover installed on a 2016 Silverado 2500HD   2016 Chevy Silverado 2500 with PML rear differential cover installed Cable and brake line clearance to PML differential cover on a 2016 Silverado 2500HD   2016 Chevy Silverado 2500 with PML rear differential cover installed, view from driver's side Driver's side view of PML differential cover installed on a 2016 Silverado 2500HD   2016 Chevy Silverado 2500 with PML rear differential cover installed, showing cables and brake line Cables and brake line routing after PML differential cover is installed on a 2016 Silverado 2500HD

    2008 Sierra 2500HD 4WD

    John installed this rear differential cover on his 2008 Sierra. His differential cover needed longer bolts than some other year and model Sierra trucks. Contact PML to determine which bolts you need and PML can provide either the longer or shorter bolts. John also installed PML transmission pan Part Number 11036.

    2008 Sierra 2500HD 4WD 2008 Sierra 2500HD 4WD   2008 Sierra 2500HD 4WD with PML differential cover installed PML Cover   Differential Cover Bolts for 2008 Sierra 2500HD 4WD Differential Cover Bolts   2008 Sierra 2500HD 4WD Differential Cover Brackets Differential Cover Brackets   2008 Sierra 2500HD 4WD with PML Transmission Pan installed PML Transmission Pan
    Click on image to view larger in a new tab or window.

    Suburban 4WD

    We were at the Off-Road Expo in Pomona, CA, and spotted this Suburban outfitted with our front and rear differential covers. The front cover is a GM 8 1/2 10 Bolt, PML part number 6077.

    PML GM 14 bolt rear cover on a Suburban Suburban with PML rear differential cover for GM 10 1/2, 14 bolts, installed   PML GM 14 bolt front cover on a Suburban PML GM 8 1/2 inch, 10 bolt front differential cover on a Suburban   Suburban 4WD Suburban 4WD
    Click on image to view larger in a new tab or window.

    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