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Hummer H1 Front and Rear Differential Cover, 12 Bolts

PML Part Number 11155, Product In Development

PML Front and Rear Hummer H1 Differential Covers, Prototype   1996 Hummer H1 stock front differential cover
Click on image to view larger.

Volume: approximately 0.5 quarts over stock

Dimensions: approximately 11.7 tall x 11.8 wide x 3.8 deep

Availability: prototype parts available now! Contact us if you are interested in our prototype program: or 310-671-4345

PML is developing a differential cover for Hummer H1 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. Pricing still to be determined.

The differentials are similar to a standard Dana Spicer AMC Model 20 cover (PML part number 5048). The cover bolt pattern, shape, and fill hole do not match however. We've also heard that this is a Torsen differential. These covers have 12 bolts and are frequently behind undercarriage protection.


PML designed this differential cover with:

  • Extra capacity
  • Fins and sand cast aluminum construction to dissipate heat from the fluid
  • Clearance for brake calipers and undercarriage protection
  • Wide gasket flange for a secure seal to the housing
  • Thick walls to add strength to the differential housing
  • Bolt on replacement for stock covers
  • Drain hole with magnetic drain plug included
  • Bosses that can optionally be machined for a temperature sending unit

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 5048-h1 height compared to stock  PML Differential Cover Part Number 5048-h1, compared to stock
Click on image to view larger.

These images show this PML differential cover compared to the stock cover.


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.

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
Top row: 1996 H1, stock rear cover, PML cover installed on rear differential
Bottom row: stock front cover, PML cover installed before undercarriage protection is put back on, PML cover installed Click on image to view larger.

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PML Differential Cover Features:

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • Thick wall construction to add strength to differential housing
  • Thick gasket flange will not bend when bolts are tightened
  • Machined gasket surface for a secure seal using RTV or factory reusable gasket
  • Oil changes without removing the cover
  • All hardware provided, including magnetic drain plug

Learn more about finishes and construction of PML parts.