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

P/N 10303-2

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 9¼ 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, we will need to know the correct bolt size for your vehicle since GM used four different bolts on these differentials. For the Hummer H2, the stock bolts are metric 8–1.25x21 mm.

Bolt Information

Note: 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. You cannot use your stock bolts with a PML cover since the PML cover is so much more substantial.

• Bolt length is measured from the underside of the head (where a washer would sit) to the tip.
• 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.

Installations

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.
       

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