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  Home > HUMMER H2 SUT > Performance >

GM 9" Ring Gear, 14 Bolt Differential Cover PML-9504
GM 9½" Ring Gear, 14 Bolt Differential Cover PML-9504

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Our Price: $235.00

Product Code: PML-9504



Description Technical Specs

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.


These PML rear end differential covers fit the 14 bolt 9 inch rear differential on many Chevy and GMC trucks, vans and SUVs and Hummer H2 (10303-2 only). PML offers three different covers to accomodate a variety of makes and models. Typical applications include the following.

Ton Trucks, 1988 to 2006:

  • C10 & K10
  • C1500 & K1500
  • Silverado 1500 & Sierra 1500
  • Silverado 1500HD & Sierra 1500HD

Ton Trucks, 1979 to 2006:

  • C20 & K20
  • C2500 & K2500
  • Silverado 2500 & Sierra 2500

Ton Vans, 1981 to 2006:

  • Vandura
  • Express
  • Savana
  • G2500

1 Ton Vans, 1982 to 1995:

  • Vandura
  • Savana
  • G3500

Suburban Ton: 1988-2006


Hummer H2 (10303-2 only)

SSR 6 Speed (10303-2 only)

Trailblazer SS (10303-2 only)

Part number 6070 generally will work on older trucks and SUVS (pre-2000) as these vehicles have plenty of clearance behind the rear differential.

Part Number 9504 was designed for newer (late 1990s and newer) GM/Chevrolet trucks and SUVs where the spare tire, frame cross member or sway bar runs behind the rear differential.

For the Hummer H2, Trailblazer SS, and SSR 6 Speed, you must use part number 10303-2.

Dimensions are provided for each part number so you can check your vehicle to make sure the PML cover will fit.

Be aware that for each model and year there may be more than one rear axle possible.

PML makes three differential covers for the GM 9 inch 14 bolt rear end.


Installation of PML Cover on 2010 Denali Part 9504

GMC 1500 Denali with a PML differential cover, extra capacity PML differential cover getting installed on a 1500 Denali PML differential cover installed on a GMC 1500 Denali, tire spacing

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

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