PML Rear Differential Cover For GM Trucks With the American Axle 11.5, 11.8" 292mm Ring Gear, 14 Bolt

Part Number 9511

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.

These trucks can also use PML Part Number 10361, which has a different fin pattern, less capacity and requires the brake bracket at the 12 o'clock position to be bent.

PML AAM 11.5, 11.8" (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)

2019 and Newer Trucks: Check carefully. A newer AAM differential is available and is slightly larger. See PML Part Number 11173.

Dodge Trucks: If you have a Dodge truck with this axle, we make a cover specifically for that application since Dodge trucks have the spare tire closer to the stock cover and need more clearance. See PML Part Number 10361 or PML Part Number 11147.

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

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

Installations

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.

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2007 Chevy Silverado 3500

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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2005 Silverado 2500HD

Brian ordered this cover in the polish finish for his Chevy 2500HD truck. Thanks to Brian for sharing the pictures.

  
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2001 2500HD Duramax Diesel

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

The brackets from the stock cover work well with the PML cover to maintain the cable routing.

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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.