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GM 9.5, 9.76 Inch Ring Gear, 12 Bolt, Rear Differential Cover
2014 to 2018 Silverado, Sierra, SUVs

PML Part Number 11129

PML 12 Bolt Rear Differential Cover, as-cast, 2014 to 2018 Silverado and Sierra 1500 PML 12 Bolt Rear Diff Cover, black powder coat, straight fin PML 12 Bolt Rear Diff Cover, polished, straight fin
As-cast finish
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Black powder coating
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Polished finish
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Volume: 0.6 quarts over stock, approximately

Dimensions: Click here for dimensions.

PML designed this rear differential cover for 2014 to 2018 Chevy Silverado and GMC Sierra 1500 trucks. This differential is also an option on GM/Chevy SUVs. Notes:

  • Cover works without spacer with Duragrip and similar aftermarket carriers, which are required when changing to 4.10 or deeper gears, see Installations below.
  • Bracket for parking brake cable probably needs to be slightly moved or bent.
  • Trucks with the V8 engine probably have the 9.5 ring gear and the optional tow package includes the 9.76 ring gear differential. These two differentials seem to have the same cover.
  • 2014 to 2018 Suburbans and Tahoes may have a sway bar behind the stock cover. See the 2015 Tahoe 5.3 Installation below.
  • 2014 to 2018 Cadillac Escalade may be able to use this cover.
  • Some trucks have the 10 bolt cover (see our GM 10 Bolt Cover).

We have had installations on 2014 to 2018 trucks.

2019 and newer models: Use a similar 12 bolt rear cover that is slightly larger and not compatible with this cover.

PML's cover features heavy duty construction, extra capacity, and fins to aid in heat dissipation.

These are pictures of the stock cover for 2014 Silverado 1500s. The cover on the left is from a 2014 Silverado 1500 5.3L Crew Cab. The cover on the right is from a 2014 Silverado 1500 6.2L Crew Cab with the Trailer Package and the 9.76 rear end.

GM, Chevy Stock 9.5 12 Bolt Rear Differential Cover    GM, Chevy Stock 9.76 12 Bolt Rear Differential Cover
Click on image to view larger.

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 11129 height compared to stock  PML Differential Cover Part Number 11129, compared to stock
Click on image to view larger.

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


We have had several installations of our cover on 2014 trucks. Our thanks to those who have emailed us their comments and pictures.

2014 Sierra

Video from a customer shows the installation of this cover on a 2014 Sierra 4WD SLE 5.3L with the standard 9.5" ring gear differential.

2014 Silverado 1500 with Aftermarket Gears

Yukon Gear tested this PML cover with their 9.5 Duragrip aftermarket carrier. The stock cover requires a spacer or modification because of clearance issues with aftermarket carriers, such as Duragrip. Aftermarket carriers are required when changing to 4.10 or deeper aftermarket gears. The PML cover does not need a spacer. This will benefit customers doing the following:

  • Adding an aftermarket limited slip carrier to stock gears
  • Changing gear ratios and using an aftermarket carrier

Clearance issues with stock cover and larger aftermaket gears, 2014 Silverado 1500    PML cover on a 2014 Silverado with Duragrip carrier and aftermarket gears
Blue putty indicates where stock cover has clearance issues. PML cover had no issues. Click on image to view larger.

Yukon Gear reported that "The PML cover has more than enough clearance and will require no modification." They used blue putty to check clearance. The PML cover has around .250” clearance between the gear and the carrier to the cover. This was without the gasket installed. The closest point of contact appears to be the outside edge of the carrier caps. Mainly the left hand side, but there was still around an 1/8” or more of clearance.

2014 Silverado 1500 with Hellwig Sway Bar

This truck is a 2014 Chevrolet Silverado 1500 4WD Regular Cab 119.0" LT with a 2LT 5.3L/325 8 Cylinder Engine. The stock sway bar was replaced with a Hellwig sway bar and the stock rear differential cover was replaced with this PML rear differential cover. There was plenty of room to remove the stock cover and install the PML cover without removing the Hellwig sway bar.

2014 Silverado 1500 5.3L Regular Cab    2014 Silverado 1500 stock cover, Hellwig Sway Bar installed    2014 Silverado 1500 stock cover, Hellwig Sway Bar, PML differential cover
2014 Silverado 1500 stock cover, PML cover stock brake line clips    2014 Silverado 1500 stock cover, Hellwig Sway Bar, PML cover, view from behind truck    Click on an image to view larger.

2014 Silverado 1500 No Tow Package

Andrew installed PML's 12 bolt Chevy rear cover on his 2014 Chevrolet Silverado 1500 5.3. His truck does not have the optional factory tow package ("max trailering package").

Andrew needed to bend the bracket for the emergency brake line to keep the cable from rubbing on the PML cover.

Read this PDF file from Andrew about his installation.

Stock Chevy 12 bolt rear cover on a Silverado 1500    PML Chevy 12 bolt rear cover on a Silverado 1500    2014 Silverado 1500 with PML Chevy 12 bolt rear cover
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2014 Silverado 1500 Max Trailering Package

John installed this PML differential cover on his 2014 Silverado 1500 5.3L with the factory Max Trailering Package. The Max Trailering Package includes a slightly larger 9.76 inch ring gear on the rear differential. The stock cover and the PML cover are the same for 9.5 inch ring gear or the 9.76 inch ring gear.

Stock Chevy 12 bolt rear cover on a Silverado 1500 with factory tow package    Silverado 1500 with max trailering package    2014 Silverado 1500 with tow package
Click on image to view larger.

2015 Chevrolet Tahoe 5.3 With Tow Package

Eddie contacted us about his 2015 Tahoe with the GM 9.5 inch rear, 12 bolt cover, 3.55 gears, locking differential and 33 spline axles. The Tahoe has sway and pan hard bars right behind the stock cover.

The PML cover is about 0.35 inches deeper than stock. There is about 0.40 inches to the sway bar on the Tahoe. After removing 0.40 inches off the top of the PML cover, Eddie sprayed it with high temp glossy black and installed the PML cover.

Read Eddie's Installation Notes. Our thanks to Eddie for his write-up and info!

Stock 2015 Tahoe 12 bolt rear differential cover, factory tow package 2015 Tahoe 5.3 factory tow package stock rear differential cover.   PML differential cover, modified, installed on a 2015 Tahoe 2015 Tahoe 5.3 with a modified PML differential cover installed.   PML differential cover modified for a 2015 Tahoe PML 12 bolt 9.5, 9.76 differential cover modified to clear the sway bar on a 2015 Tahoe.
Stock 2015 Tahoe 12 bolt rear differential cover, factory tow package, clearance to pan hard and sway bars Clearance from stock rear differential cover to sway bar on a 2015 Tahoe.   PML differential cover, modified, clearance to pan hard and sway bars on a 2015 Tahoe Clearance from modified PML cover to sway bar on a 2015 Tahoe.   Click on any image to view larger.

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

Learn more about finishes and construction of PML parts.