My Cart: 0 item(s)

Product Search
Product Search

Secure Checkout
AAM 12 Inch Ring Gear for GM Trucks
    AAM 12 Inch Ring Gear for GM Trucks
    Purchase AAM 12 Inch Ring Gear for GM Trucks
    • AAM 12 Inch Ring Gear for GM Trucks
      Part Number: dc-asm-11173

    • New! For 2020 and newer GMC Sierra and Chevy Silverado 2500HD and 3500HD. Ring gear may be 11.5 or 11.8 or 12 inches.

      Cover includes magnetic drain plug and mounting hardware.
      Price varies with finish. READ MORE

      $0.00

    • OPTIONAL - add machining of a 1/8 NPT hole for an aftermarket temperature sending unit:
    •  

    Number of bolts: 14

    Volume: about 0.5 quarts over 2020 stock GM truck cover

    Dimensions: Click HERE for dimensions.

    Description: 2020 and newer GMC/Chevy heavy duty trucks have a new version of the American Axle Manufacturing (AAM) 14 bolt differential. The ring gear may be 12 inches or 11.8 or 11.5.

    Pictures of PML new AAM 14 Bolt for 2020 and newer Silverado and Sierra 2500 and 3500 trucks:

    2020 and newer GM truck 14 bolt PML differential cover 2020+ 14 bolt PML cover for GM HD trucks   GM New PML AAM 12 inch differential cover, angle view PML rear differential cover, view of level check hole   GM 2020 and newer 14 bolt PML differential cover, black powder coat 2020+ 14 bolt PML cover for GM HD trucks, black powder coat finish
    Part shown in natural as cast finish and in black powder coat finish. Click on image to view larger.

    This new American Axle differential has a cover very similar in shape and bolt hole pattern to the cover on 2001 to 2019 trucks. But the covers and gaskets are not the same and not interchangeable.

    Benefits:

    • Drain and magnetic drain plug included
    • Heavy duty, sand cast aluminum
    • Finned for heat dissipation
    • Works with brake line bracket, no modification needed
    • About 3/8 inches deeper than stock for clearance to sway or pan hard bars
    • Shape similar to stock cover
    • Extra capacity

    GM vehicles that probably have these new differentials:

    • 2020 GMC Sierra 2500 and 3500 trucks
    • 2020 Chevrolet Silverado 2500 and 3500 trucks

    Configurations vary. Always check your vehicle to verify differential and clearance.

    The GM gasket part number for this differential is 68454491AA.

    For 2019 and older trucks with the AAM 11.5, 11.8 differential, see PML part number 9511.

    Installation on 2020 Denali

    Jody installed this PML rear differential cover on his 2020 GMC Sierra 2500 Denali with the Duramax engine. He reported that the installation went well.

    2020 Sierra 2500 Denali Duramax 2020 Sierra 2500 Denali Duramax   PML AAM 12 inch rear differential cover installed on 2020 Denali Duramax PML cover installed   PML AAM 12 inch 14 bolt cover installed on 2020 Denali, works with stock bracket PML cover installed, works with stock bracket
    Click on image to view larger in a new tab or window.

    PML Cover Compared to GM Stock Cover

    PML cover next to GM stock cover, outside and inside.

    PML cover compared to GM 2020 and newerrear differential cover   Inside of PML cover compared to GM 2020 and newerrear differential cover
    Click on image to view larger.

    Stock Covers and Gaskets

    2020 GMC Sierra 2500 Gas Engine Stock Rear Differential Cover:

    2020 and newer GMC and Chevrolet stock rear differential cover  Click on image to view larger.

    2020 and newer GM HD truck stock cover (outside, inside, part number):

    2020 and newer GMC and Chevrolet stock rear differential cover   Inside of 2020 and newer GMC and Chevrolet stock rear differential cover   Part number for 2020 and newer GMC and Chevrolet stock rear differential cover
    Click on image to view larger.

    For comparison, here is the 2001 to 2019 stock differential cover:

    2001 to 2019 stock rear differential cover  Click on image to view larger.

    2019/2020 and Newer Gasket (GM gasket part number 68454491AA) and Gasket for Prior AAM 11.5, 11.8 Differentials:

    New AAM gasket compared to pre 2019 gasket  Click on image to view larger in a new tab or window.