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Hummer H1
    Hummer H1
    Purchase Hummer H1
    • Hummer H1
      Part Number: dc-asm-11155

    • Out of stock until Fall 2021. Apologies for the delay.

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

      $0.00

      Shipping Weight: 9.00 pounds

      Quantity in Basket:  None

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

    Number of Bolts: 12 bolts

    Volume: approximately 0.5 quarts over stock

    Dimensions: approximately 11.7 tall x 11.8 wide x 3.8 deep

    PML designed this differential cover for Hummer H1 and HMMWV Humvee. It fits both the front and rear axles and works with standard undercarriage protection and brake calipers.

    Benefits:

    • Extra capacity
    • Drain and magnetic drain plug for easier servicing
    • Fins and sand cast aluminum construction to dissipate heat from the fluid
    • Bolt on replacement for stock covers
    • Wide gasket flange for a secure seal to the housing
    • Thick walls to add strength to the differential housing
    • Bosses that can optionally be machined for a temperature sending unit
    • Includes new mounting bolts, fill plug and magnetic drain plug

    This differential cover has been installed on many Hummer H1 as well as M998 Humvee (HMMWV) vehicles. The front and rear differential are the same and this cover fits both.

    No modifications to standard undercarriage protection needed. It is designed to slide between the brake calipers.

    Always check your vehicle to verify configuration and clearance before ordering.

    Our thanks to those who have emailed us pictures of their installations.

    • 2003 Hummer H1
    • 2000 Hummer H1
    • 1996 Hummer H1
    • 1989 Humvee M998 6.2L Diesel

    2003 Hummer H1

    Jason H1 Rescue in Texas installed front and rear differential covers on Jeff's 2003 Hummer H1 with a Duramax swap.

    The front does not have a skid plate or protective cage covering it. The hardest part of the installation was getting the PML cover passed the winch control box.

    With stock rotors (11") there was 1/4 to 1/2 inch clearance, no problem. A little tighter, but fine. The brakes have been changed over to an Alpha with 12 inch rotors. This provided a bit more clearance with the fitment of the PML covers.

    On Jeff's H1, stock capacity was 2 quarts. With the PML covers, the capacity increased to 2.6 quarts per differential.

    Jeff has seen a temperature drop of 10 degrees with the PML differential covers.

    Images show: 2003 H1, stock front differential cover, PML front differential cover, PML cover and supplies, on rear distance from PML cover to cage, PML cover installed on rear

    2003 Hummer H1   2003 Hummer H1 stock front diff cover   2003 Hummer H1 PML differential cover on front
    2003 Hummer H1 change differential gear oil and covers   2003 Hummer H1 rear diff cover distance to cage   2003 Hummer H1 with PML rear differential cover installed

    Click on image to view larger.

    2000 Hummer H1

    This 2000 Hummer H1 with a Duramax engine has an aftermarket brake kit so the brakes were larger than stock. To remove the stock cover and install the PML cover, one caliper was loosened, the PML cover slid on, then the caliper was retighted. No modifications needed.

    2000 Hummer H1 Duramax   2000 Hummer H1 differential aftermarket brake kit   2000 Hummer H1 Duramax with PML differential cover
    Click on image to view larger.

    1996 Hummer H1

    Jose's Auto Service, 310-672-4253, installed this PML differential cover on the front and rear of a 1996 Hummer H1. Our thanks to Jose for all the pictures and choosing PML covers.

    Images show: 1996 H1, stock rear cover, PML cover installed on rear differential, stock front cover, PML cover installed before undercarriage protection is put back on, PML cover installed

    1996 Hummer H1   1996 Hummer H1, stock rear differential cover   1996 Hummer H1, pml cover installed on rear differential
    1996 Hummer H1 stock front differential cover   1996 Hummer H1 front differential with PML cover   1996 Hummer H1 front differential with PML cover and undercarriage protection installed
    Click on image to view larger.

    1989 Humvee M998

    Louis installed this cover on the front and rear differentials of his 1989 Humvee M998 6.2L Diesel. He emailed us that the covers fit well on front and back without any modifications and he likes the extra oil capacity.

    1989 Humvee M998 1989 Humvee M998 Diesel   Humvee and PML covers Humvee stock cover and PML cover   PML cover installed on rear of Humvee 1989 Humvee rear differential with PML cover installed   PML differential cover installed on 1989 Humvee front 1989 Humvee front differential with PML cover installed
    Click on image to view larger in a new tab or window.

    Aftermarket Brake Calipers

    On Hummer H1 the front and rear differentials are the same. This cover fits both. It is designed to slide between the brake calipers.

    On an H1 with an aftermarket brake kit with larger calipers, one of the calipers had to be loosened to remove the stock covers and install this PML differential cover. After installation, the caliper was retighted. No modifications were needed. We do not know which brake kit so there may be variations.

    This installation is on a H1 with stock brake calipers.

    1996 Hummer H1 stock front differential cover  Click on image to view larger.

    Included With Cover

    PML Hummer differential covers ship with new mounting bolts, washers, fill plug, and a magnetic drain plug.

    PML H1 cover ships with bolts and drain plug  Click on image to view larger.

    Inside of Cover, Drain Hole, and Fill/Level Check Hole

    Drain: Drain on bottom of cover for easy fluid changes. Magnetic drain plug included.

    Drain on bottom of PML differential cover for Hummer H1   Click on image to view larger.

    Inside: The PML cover features an open interior like the stock cover. The PML cover is round, following the same general shape as the stock cover.

    Inside of PML differential cover for Hummer H1  Click on image to view larger.

    Fill Hole: The fill/level check hole on the PML cover is at the same height as on the stock cover for an accurate fluid level. This hole is on the front of the cover for easy access, as seen in the above pictures. PML provides a plug for the hole.

    PML Differential Cover Compared to Stock

    PML Differential Cover Part Number 11155 compared to stock   PML Differential Cover Part Number 11155, compared to stock, top view
    Click on image to view larger in a new tab or window.