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GM 10½" Ring Gear, 14 Bolt
Patterned Fins
Differential Cover

P/N 9369

PML GM 10½ Diff Cover, as-cast PML GM 10½ Diff Cover, black powder coat PML GM 10½ Diff Cover, polished
As-cast finish
3/8-in bolts: Go To Cart
8mm bolts: Go To Cart
Black powder coating
3/8-in bolts: Go To Cart
8mm bolts: Go To Cart
Polished finish
3/8-in bolts:Go To Cart
8mm bolts:Go To Cart

Volume: 1.0 qt. over stock

Dimensions: Click here for dimensions.

PML makes two different rear end covers for the GM 10½ differential: this one and a part number 6060, a straight fin cover.

This differential cover fits heavy duty trucks and vans such as Chevy and GMC 2500 and 3500.


Typical applications include the following. Be aware that for each model and year there may be more than one rear axle possible so please check before ordering. See also GM 14 bolt 9½ and AAM 14 bolt 11½.

¾ Ton Truck, 1973 to Current

  • C20 & K20
  • C2500 & K2500
  • Silverado 2500 & 2500HD
  • Sierra 2500 & 2500HD

1 Ton Truck, 1973 to Current

  • C30 & K30
  • C3500 & K3500
  • Silverado 3500 & Sierra 3500

¾Ton Van, 1973 to Current:

  • Vandura
  • Express
  • Savana
  • G20
  • G2500

Vehicles with towing packages may have limited space for a larger differential cover. Please check dimensions, clearance and fitment carefully before ordering.

This 14 bolt 10 1/2-inch differential cover uses 12 of the 14 bolts. The bolt hole at the bottom was removed because the drain boss is best located there. At the top of the cover another bolt hole was removed. The flange is 3/8-inch thick and blanchard ground to be flat and smooth. We have sold many of these and have never had a problem with leaking. The flange is very strong and the 2 bolts left out are not missed.

Please check and order the correct mounting bolt thread diameter. These differentials were made with 3/8-inch (.375 inch) and 8mm (.315 inch) bolts. PML offers the cover in both versions: P/N 9369-1 is for 3/8-inch bolts and P/N 9369-2 is for 8mm bolts.

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 9369 height compared to stock  PML Differential Cover Part Number 9369, compared to stock
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These images show this PML differential cover compared to the stock cover.

This image compares the depth of both PML GM 10 1/2 inch 14 bolt rear differential covers and the stock cover. Click on image to view larger in a new tab or window.
PML GM 10 1/2 Differential Covers depth comparisons

Installation on a 1998 K3500

Mike installed this PML differential cover on his 1998 K3500. He does a lot of towing with his K3500 and wants to keep his fluid cooler during trips. He installed the PML rear cover and a transmission pan in 2004. Ten years later the truck still runs great.

PML differential cover on K3500 PML GM 4L80E early tranny pan, as-cast PML GM 4L80E early tranny pan, as-cast

Images from left to right: PML differential cover installed, K3500 towing a trailer, PML pan installed.
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Click here for information on the PML transmission pan for the C/K3500.

Installation on a 1993 Chevy 3500 Dually

PML differential cover on 1993 Chevy 3500
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PML differential cover for GM 10 1/2 inch ring gear, 14 bolts, installed on a 1993 Chevy 3500 dually. The PML cover can help keep the differential cool when towing or hauling much heavier (but less attractive) cargo. Our thanks to Joey for the picture.

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.