PML GM 9½" Ring Gear, 14 Bolt  Differential Cover for Hummer H2
PML GM 9½" Ring Gear, 14 Bolt  Differential Cover for Hummer H2
PML GM 9½" Ring Gear, 14 Bolt  Differential Cover for Hummer H2

PML GM 9½" Ring Gear, 14 Bolt Differential Cover for Hummer H2


Regular price $220.00 Save $-220.00

-1 in stock

Volume: 0.5 qt. over stock

Dimensions: Click here for dimensions.

This diff cover fits the rear end on Hummer H2, Trailblazer SS, SSR 6 speed, and other Chevy and GMC trucks, vans and SUVs with the 9½ inch 14 bolt rear differential. PML makes three covers for the GM 9½" rear differential and designed this cover for Hummer H2s and similar vehicles that have less space or clearance issues but still want the benefits of an aftermarket cover.

See all PML GM 9½" differential covers.

If you do not have an H2 and wish to order this cover, you will need to contact us and let us know what bolt size you have. Please see the Bolt Information section on this page: GM straight fin cover. For the Hummer H2, the stock bolts are metric 8–1.25x21 mm.

Bolt Information

PML includes mounting bolts with all differential covers. PML provides bolts that are longer than the stock bolts since the flange on PML's cover is much thicker than stock. The bolts with the stock cover will not work.

GM has used four different bolts on these differentials so to complete your order, we need to know which bolts you have. These differentials have used both metric and standard cover bolts. The bolt length has not been consistent either. When ordering one of these covers, you will need to pull one of your stock bolts out (a top bolt is best) and measure the length and determine whether it is metric or standard.

  • Bolt length is measured from the underside of the head (where a washer would sit) to the tip. If the bolts are metric, the length will be 21mm or 16mm. If the bolt is standard, the length will be 5/8 inch or 7/8 inch.
  • Metric bolts will have 20 threads per inch, standard ones will have 18. Also, a bolt head with lines or letters on it is typically standard. A bolt with numbers such as 5.8, 9.8, 10.9, or 12.9 is likely to be metric.

We know this is a hassle, but we do not want to send the wrong bolts or charge everyone a lot of extra money to cover sending all possible bolts with each cover.

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 10303-2 height compared to stock
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PML Differential Cover Part Number 10303-2, compared to stock
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These images show this PML differential cover compared to the stock cover.


Installations of PML Cover on H2 Hummers — Part 10303-2

PML rear end differential cover for Hummer H2 installations are below. The ones one the left and right are black powder coated and the one in the middle is polished. All have been customized with lift kits. The image on the right is courtesy of Scott who also installed and sent us a picture of PML's transmission pan for the H2 installed.
PML rear end differential cover on a Hummer H2, black powder coat finish PML rear end differential cover on a Hummer H2, polished finish PML differential cover and transmission pan Hummer H2 installations

Installation on 2000 Silverado 2500

PML GM differential cover installed on a Silverado 2500

The image at left shows this PML 14 bolt 9.5 ring gear straight fin cover installed on a 2000 Silverado 2500 6.0 LS. This cover is in the natural as-cast finish.

Our thanks to Eugene (retired Marine) for sending us pictures of his installation and for his service to our country.

For a larger picture, please click one of the above images. A separate window will open showing a bigger picture. (The larger pictures take a minute to display.)

PML Differential Cover Features:

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • 3/16-inch thick wall construction to add strength to differential housing
  • 3/8-inch 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.