GM 9.5, 9.76 Inch Ring Gear, 12 Bolt, Rear Differential Cover
2014 to 2018, some 2019, Silverado, Sierra, SUVs

PML Part Number 11129

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 and SUVs. Some 2019 models may also be able to use this cover.

Benefits:

• Heavy duty construction
• Extra capacity
• Fins for cooling
• Drain hole and magnetic drain plug included
• New mounting bolts included
• Works without spacer with Duragrip and similar aftermarket carriers when changing to 4.10 or deeper gears

Applications:

• 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: May use a similar 12 bolt rear cover that is slightly larger and not compatible with this cover. The GM part number for the gasket for this differential is 22943110. If you have a 2019 and newer with a different OEM gasket part number, see PML Part Number 11172.

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.

  
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Inside of PML Cover

The PML differential cover follows the same general shape of the stock cover. The interior is mostly smooth.

Space for the extra capacity is at the bottom

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PML Differential Cover Compared to Stock

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

Installations

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

• 2017 Sierra
• 2014 Sierra
• 2014 Silverado, Aftermarket Gears
• 2014 Silverado, Hellwig Sway Bar
• 2014 Silverado, No Factory Tow Package
• 2014 Silverado, With Factory Tow Package
• 2016 Chevrolet Tahoe 5.3 With Tow Package
• 2015 Chevrolet Tahoe 5.3 With Tow Package

2017 Sierra

These images are from 2017 GMC Sierra 1500 trucks with this PML rear differential cover. These trucks are customized with aftermarket parts and paint.

PML cover on 2017 GMC Sierra show truck   2017 Sierra show truck, right side   2017 Sierra show truck with PML cover
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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

  
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.

     
      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 slightly bend the bracket for the emergency brake line to keep the cable from rubbing on the PML 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.

     
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2016 Chevrolet Tahoe 5.3 With Tow Package

Brian had PML machine off the top of this PML cover to add clearance for the pan hard and sway bar on his 2016 Tahoe with the tow package. Brian needed to remove a little more material from the top of the 3rd and 4th fins and it is a still tight fit.

Brian also installed a PML 6L80 transmission pan on his Tahoe (2nd picture).

PML cover on 2016 Tahoe   PML 6L80 transmission pan on 2016 Tahoe with tow package   PML cover modified for 2016 Tahoe with tow package   Modification to PML cover to add clearance
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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!

2015 Tahoe 5.3 factory tow package stock rear differential cover.   2015 Tahoe 5.3 with a modified PML differential cover installed.   PML 12 bolt 9.5, 9.76 differential cover modified to clear the sway bar on a 2015 Tahoe.
Clearance from stock rear differential cover to sway bar 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.