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GM AAM 9.5, 9.76 12 Bolt Rear
    GM AAM 9.5, 9.76 12 Bolt Rear
    Purchase GM AAM 9.5, 9.76 12 Bolt Rear
    • GM AAM 9.5, 9.76 12 Bolt Rear
      Part Number: dc-asm-11129

    • Cover includes magnetic drain plug and mounting hardware.
      Price varies with finish. SEE PRODUCT INFO.

      $0.00

    • OPTIONAL - add machining of a 1/8 NPT hole for an aftermarket temperature sending unit:
    •  

    Number of Bolts: 12 bolts

    Volume: 0.6 quarts over stock, approximately

    Dimensions: Click here for dimensions.

    PML designed this rear differential cover for 2014 to 2019 Chevy Silverado and GMC Sierra 1500 trucks and SUVs. Some 2019 models may have newer GM 9.5 differential, see Applications.

    Benefits:

    • Heavy duty construction
    • Extra capacity
    • Fins for cooling
    • Drain hole and magnetic drain plug for easy servicing
    • New mounting bolts included
    • Works with Duragrip and similar aftermarket carriers when changing to 4.10 or deeper gears, no spacer needed

    This PML 12 bolt GM AAM differential cover is designed to replace the stock cover on these vehicles:

    • 2014 to 2018 Silverado 1500
    • 2014 to 2018 Sierra 1500
    • 2014 to 2018 GMC/Chevy SUVs (modifications needed for Escalade, Suburban, Tahoe, Yukon!)
    • 2019 models may be able to use this cover or may have the newer GM 9.5 axle (see note below)

    Always check your vehicle to verify configuration and clearance. Configurations vary. Some trucks have the GM 8.5 10 bolt differential.

    Aftermarket Carriers: Cover works without spacer with Duragrip and many aftermarket carriers, which are required when changing to 4.10 or deeper gears. See Installations for an example.

    Installation Note: Bracket for parking brake cable probably needs to be slightly moved or bent.

    Modifications for SUVs (Escalade, Suburban, Tahoe, Yukon):

    • 2014 to 2018 Escalade, Suburban, Tahoe, and Yukon usually have a sway bar behind the stock cover that is very close to the stock differential cover. This cover has been modified to fit. See Installations for examples on Tahoe SUVs.
    • PML can modified the cover for a custom machining charge. Call for details.
    • If vehicle is lifted or has aftermarket sway or panhard bars, this cover may fit without modification.

    Tow Package: Trucks with the optional tow package usually include the 9.76 inch ring gear differential. These cover is the same.

    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.

    Stock cover for GM AAM 9.5, 9.76 compared to stock cover for new GM 9.5:

    GM AAM Stock 9.5, 9.76 12 Bolt Rear Differential Cover      GM 9.5 12 Bolt Rear Differential Cover
    Click on image to view larger. Area around and below fill hole is different.

    Our thanks to those who have emailed us their comments and pictures.

    • 2018 Silverado 1500
    • 2015 Silverado 6.2L
    • 2014 Silverado 1500 with Aftermarket Gears
    • 2014 Silverado 1500 with Hellwig Sway Bar
    • 2014 Silverado 1500 No Tow Package
    • 2014 Silverado 1500 Max Trailering Package
    • 2014 Silverado 1500 4wd 5.3L

    • 2017 Sierra

    • 2016 Tahoe 5.3L With Tow Package
    • 2015 Tahoe 5.3L With Tow Package

    2018 Silverado 1500

    Jim installed this PML differential cover on his 2018 Chevy Silverado 5.3L with 11" lift and 38 x 13.50 Nitto Trail Grapplers.

    2018 Chevy Silverado 1500 2018 Silverado 1500   2018 Chevy Silverado 1500 stock cover Stock Cover   2018 Chevy Silverado 1500 with PML cover installed PML cover   2018 Chevy Silverado 1500 with PML cover installed 2 PML cover 2
    Click on image to view larger in a new tab or window.

    2015 Silverado 6.2L

    Rich installed this PML differential cover on his 2015 Chevy Silverado 6.2L and used ARP 12 point fasteners.

    2015 Chevy Silverado 2015 Silverado   2015 Chevy Silverado with stock differential cover Stock Cover   2015 Chevy Silverado with PML differential cover installed PML Cover  
    Click on image to view larger in a new tab or window.

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

    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
    Click on image to view larger.

    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.

    2014 Silverado 1500 4wd 5.3L

    Viktor installed this PML differential cover on his 2014 Chevrolet Silverado 1500 5.3L 6L80 LTZ 4x4. He also installed GM PML transmission pan P/N 11025

    2014 Chevy Silverado 1500 4wd 5.3L with PML differential cover installed PML cover   2014 Chevy Silverado 1500 4wd 5.3L with PML transmission pan installed PML Pan
    Click on image to view larger in a new tab or window.

    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.

    2017 Sierra 1500 with PML 12 bolt differential cover PML cover on 2017 GMC Sierra show truck   2017 GMC Sierra 1500 show truck 2017 Sierra show truck, right side   2017 GMC Sierra 1500, aftermarket suspension, PML cover installed 2017 Sierra show truck with PML cover
    Click on image to view larger in a new tab or window.

    2016 Tahoe 5.3L 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 with tow package PML cover on 2016 Tahoe   PML transmission pan on 2016 Tahoe PML 6L80 transmission pan on 2016 Tahoe with tow package   Clearance to modified PML cover on 2016 Tahoe with tow package PML cover modified for 2016 Tahoe with tow package   Modification to PML cover to add clearance for 2016 Tahoe Modification to PML cover to add clearance
    Click on image to view larger in a new tab or window.

    2015 Tahoe 5.3L 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.

    Optional Temperature Sensor Machining

    This differential cover has an undrilled boss for an aftermarket temperature sending unit. Optionally, PML can drill and tap a 1/8 NPT hole. The boss is located on the side below the fill hole.

    Stock Covers

    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.

    Inside of PML Cover

     Click on image to view larger.

    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

    PML Differential Cover Compared to Stock

    PML Differential Cover Part Number 11129 compared to stock   PML Differential Cover Part Number 11129, compared to stock, top view
    Click on image to view larger in a new tab or window.