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American Axle 11½" 292mm Ring Gear, 14 Bolt
Rear Differential Cover For GM Trucks

P/N 9511

PML AAM Diff Cover For Dodge Trucks, as-cast PML AAM Diff Cover For Dodge Trucks, black powder coat PML AAM Diff Cover For Dodge Trucks, polished
As-cast finish
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Black powder coating
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Polished finish
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Volume: 1 qt. over stock

Dimensions: Click here for dimensions.

PML designed this differential cover for the American Axle rear end on Duramax trucks with the Allison transmission. The cover has space at the top and includes longer bolts for the brake bracket.

This differential cover fits Chevrolet Silverado and GMC Sierra 2500HD & 3500 with the Duramax or 8.1 engine, 2001 and newer. These trucks can also use PML P/N 10361, which has a different fin pattern, less capacity and requires the brake bracket at the 12 o'clock position to be bent. Click here for P/N 10361.

If you have a Dodge Ram with this axle, click here for our Dodge cover since this cover will not work on Dodge trucks.

PML AAM 11.5" (292mm) differential cover for GM trucks is designed for:

  • 2001 and newer Sierra/Silverado 2500HD with Duramax diesel
  • 2007 Sierra/Silverado 2500HD Classic with Duramax diesel
  • 2001 to 2006 Sierra/Silverado 3500 with 8.1 V8 gas engine or Duramax diesel
  • 2007 Sierra/Silverado 3500 Classic with 8.1 V8 gas engine or Duramax diesel
  • 2007 and newer Sierra/Silverado 3500HD with Duramax diesel
  • Some 2007 and newer Sierra/Silverado 3500HD with 6.0 V8 gas engine (some have the American Axle 10.5" differential)

The differential cover has oil fill/level check hole and a drain hole with a magnetic plug to facilitate oil changes.

If you have an oversized spare tire, you may need to move the tire towards the rear. There is tube that holds the spare tire in place and the position can be easily adjusted.

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 9511 height compared to stock  PML Differential Cover Part Number 9511, compared to stock
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These images show this PML differential cover compared to the stock cover.


2016 GMC Sierra 2500HD Denali

Status Custom Shop in Rockwall, TX, installed a polish finish cover on their build of a 2016 GMC 2500 Denali. The truck has a 10 inch FTS lift, powder coated Illusion Purple, with 26x16 American Force 2 piece Spartans wrapped in black bear, 37/13.50 tires, Diamond Audio HEX Pro Series.

2016 GMC Denali 2500HD    2016 GMC Denali 2500HD    2016 GMC Denali 2500HD

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PML differential cover on a 2007 3500 Duramax Diesel

2007 Chevy Silverado 3500 with PML Differential Cover

This 2007 Chevy Silverado 3500 carries a heavy load with the help of this PML differential cover. The aluminum construction and extra capacity help keep the fluid cool for less wear and tear on the gears and seals. And it looks great.

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PML differential cover on a 2001 2500HD Duramax Diesel with Allison Transmission

2001 2500HD Duramax with PML Differential Cover

PML differential cover shown in as-cast finish on a 2001 2500HD Allison Duramax Diesel.

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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.