Product Overview
Volume: about 0.5 quarts over 2020 stock GM truck cover
Dimensions: Click here for dimensions. 
Number of Bolts: 14
Description: 2020 and newer GMC/Chevy heavy duty trucks have a new version of the American Axle Manufacturing (AAM) 14 bolt differential. The ring gear may be 12 inches or 11.8 or 11.5.
Pictures of PML new AAM 14 Bolt for 2020 and newer Silverado and Sierra 2500 and 3500 trucks:
Part shown in natural as cast finish and in black powder coat finish. Click on image to view larger.
This new American Axle differential has a cover very similar in shape and bolt hole pattern to the cover on 2001 to 2019 trucks. But the covers and gaskets are not the same and not interchangeable.
Benefits:
- Drain and magnetic drain plug included
- Heavy duty, sand cast aluminum
- Finned for heat dissipation
- Works with brake line bracket, no modification needed
- About 3/8 inches deeper than stock for clearance to sway or pan hard bars
- Shape similar to stock cover
- Extra capacity
Applications:
GM vehicles that probably have these new differentials:
- 2020 GMC Sierra 2500 and 3500 trucks
- 2020 Chevrolet Silverado 2500 and 3500 trucks
Configurations vary. Always check your vehicle to verify differential and clearance.
The GM gasket part number for this differential is 68454491AA.
This includes trucks with the Allison transmission.
For 2019 and older trucks with the AAM 11.5, 11.8 differential, see PML part number 9511.
PML Cover Compared to GM Stock Cover
PML cover next to GM stock cover, outside and inside.
Click on image to view larger.
Stock Covers and Gaskets
2020 GMC Sierra 2500 Gas Engine Stock Rear Differential Cover:
Click on image to view larger.
2020 and newer GM HD truck stock cover (outside, inside, part number):
Click on image to view larger.
For comparison, here is the 2001 to 2019 stock differential cover:
Click on image to view larger.
2019/2020 and Newer Gasket (GM gasket part number 68454491AA) and Gasket for Prior AAM 11.5, 11.8 Differentials:
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