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Hummer H1 Front and Rear Differential Cover, 12 Bolts

PML Part Number 11155

Includes bolts, fill plug and magnetic drain plug.

Volume: approximately 0.5 quarts over stock

Dimensions: approximately 11.7 tall x 11.8 wide x 3.8 deep

This differential cover has been installed on many Hummer H1 as well as M998 Humvee (HMMWV) vehicles.

On Hummer H1 the front and rear differentials are the same. This PML cover will fit both axles and works with standard undercarriage protection. 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.

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

Benefits

1996 Hummer H1 stock front differential cover

PML designed this differential cover with:

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 11155 height compared to stock  PML Differential Cover Part Number 11155, compared to stock
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These images show this PML differential cover compared to the stock cover.

Installations

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

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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
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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
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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
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