Volume: 1 quart over stock
Dimensions: Click here for dimensions.
Number of Bolts: 14 bolts
PML designed this American Axle 11.5 (292mm), 11.8 inch (300mm) ring gear differential cover for the rear end on heavy duty Silverado and Sierra trucks with the Duramax diesel or V8 gas engine.
For the brake bracket, the cover has space at the top and includes longer bolts.
- Extra capacity
- Open interior
- Drain, oil fill, and level check holes to make it easy to follow the 15K oil change interval
- Magnetic drain plug and new mounting hardware included
- Finned for heat dissipation and a custom look
- Heavy duty, sand cast aluminum construction
- Machined gasket flange for a secure seal
- Works with stock cover brake bracket
- Option for temperature sensor machining
Watch a YouTube video of this cover being installed on a 2005 Silverado Duramax: https://youtu.be/w45lVZSI2OU
PML AAM 11.5, 11.8 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 GM 10.5 inch ring gear, 14 bolt differential)
Always check your vehicle to verify differential and clearance. Configurations vary. Large spare tires may need adjusting toward the rear to increase clearance.
2019, 2020 and newer trucks: These trucks may have the similar AAM 12". Starting around 2020 models, GM changed to a slightly larger differential that looks very similar to this one. See PML AAM 12.0 14 Bolt differential cover for more information.
Some of these trucks can also use PML AAM 11.5 14 Bolt For Ram, which has a different fin pattern, less capacity and requires the brake bracket at the 12 o clock position to be bent.
This cover will fit the AAM 11.5, 11.8 differential on Ram trucks also. However most Ram trucks have the spare tire close to the stock cover and need more clearance than this cover provides. PML makes a cover specifically to fit Ram trucks with the AAM 11.5, 11.8.
Our thanks to those who have emailed us their installation pictures and comments.
- 2017 Sierra 3500HD
- 2016 Sierra 2500HD Denali
- 2012 Ram 2500 Diesel 4x4
- 2007 Silverado 3500
- 2005 Silverado 2500HD (pictures and video)
- 2005 Silverado 2500HD
- 2001 2500HD Duramax
2017 GMC Sierra 3500HD
David installed this PML differential cover on his Duramax.
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.
2012 Ram 2500 Diesel 4x4
PML rear and front differential covers and transmission pan look great in custom powder coat. The covers started in the natural as-cast finish and Kevin had them powder coated with the rest of the suspension to a custom teal blue.
Kevin's 2012 Ram Megacab is a 2019 SEMA Show truck. The truck is also known as the "Alberta Adventurer" and features an 8 inch lift, BDS long arms, and American Force wheels.
2019 SEMA Truck, 2012 Ram 2500 Lifted, PML Differential Cover
2012 Ram 2500 Lifted, PML Rear Differential Cover
2012 Ram 2500, PML 68RFE transmission pan installed
Click on image to view larger in a new tab or window.
For the front differential cover, see PML Part Number 11118 and for the transmission pan, see PML Part Number 11161.
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.
2005 Silverado 2500HD
This is the new PML shop truck, a 2005 Duramax LS 2WD Long Bed. As soon as we got the truck, we installed our 14 bolt rear differential cover and our Allison transmission pan. Installation by Torrance Transmission. Click on an image to view a larger one in a new tab or window.
1st picture: Truck
2nd picture: Transmission pan
3rd picture: OEM differential cover
4th picture: Gears
5th picture: Good amount of space between PML cover and spare tire
6th picture: Brake line and brackets attach to PML cover just like OEM cover
7th picture: PML differential cover installed on 2005 Duramax
Videos of differential cover and transmission pan installations:
2005 Silverado 2500HD
Brian ordered this cover in the polish finish for his Chevy 2500HD truck. Thanks to Brian for sharing the pictures.
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.
Drain, Oil Fill, Level Check and Hardware
The differential cover has oil fill/level check hole and a drain hole with a magnetic plug to facilitate oil changes.
PML includes new mounting bolts, magnetic drain plug with a reusable copper sealing washer and a fill plug with each cover.
Optional Machining for Temperature Sending Unit
This cover has an undrilled boss below the level check hole. Optionally, PML drill and tap this boss with a 1/8 NPT hole for an aftermarket temperature sending unit.
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.