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GM 9½" Ring Gear
14 Bolt Rear
Differential Covers

Part Numbers
6070, 9504, 10303-2

Part # 6070 Straight Fin
1 qt over stock, 4¾ inches tall
For pre-2000 trucks

Part # 9504 Patterned Fin
1 qt over stock, 3½ inches tall
For newer trucks

Part # 10303-2 Straight Fin
0.5 qt over stock, 3¼ inches tall
For Hummer H2, Trailblazer SS, More

PML GM 9½ Straight Fin Diff Cover, as-cast PML GM 9½ Diff Cover, as-cast PML GM 9½ Diff Cover for H2, as-cast
PML GM 9½ Straight Fin Diff Cover, black powder coat PML GM 9½ Diff Cover, black powder coat PML GM 9½ Diff Cover for H2, black powder coat
No image available of a polished part number 6070. PML GM 9½ Diff Cover, polished PML GM 9½ Diff Cover for H2, polished

Volume: 1.0 qt. over stock (approximately)

Volume: 1.0 qt. over stock (approximately)

Volume: 0.5 qt. over stock (approximately)

Dimensions: Click here for 6070 dimensions.

Dimensions: Click here for 9504 dimensions.

Dimensions: Click here for 10303-2 dimensions.


These PML rear end differential covers fit the 14 bolt 9½ inch rear differential on many Chevy and GMC trucks, vans and SUVs. PML offers three different covers to accomodate a variety of makes and models. Typical applications include the following.

  ½ Ton Trucks, 1988 to 2013:

  • C10 & K10
  • C1500 & K1500
  • Silverado 1500 & Sierra 1500
  • Silverado 1500 SS
  • Silverado 1500HD & Sierra 1500HD

¾ Ton Trucks, 1979 to 2004:

  • C20 & K20
  • C2500 & K2500
  • Silverado 2500 & Sierra 2500 (not HD)

¾ Ton Vans, 1981 to 2013:

  • Vandura
  • Express
  • Savana
  • G2500

1 Ton Vans, 1982 to 1995:

  • Vandura
  • Savana
  • G3500

Suburban ¾ Ton: 1988-2013

Avalanche (see 10303-2)

Hummer H2 (10303-2 only)

SSR 6 Speed (10303-2 only)

Trailblazer SS (10303-2 only)

Part number 6070 generally will work on older trucks and SUVS (pre-2000) as these vehicles have plenty of clearance behind the rear differential.

Part Number 9504 was designed for newer (late 1990s and newer) GM/Chevrolet trucks and SUVs where the spare tire, frame cross member or sway bar runs behind the rear differential.

For the Hummer H2, Trailblazer SS, and SSR 6 Speed, you must use part number 10303-2.

Dimensions are provided for each part number so you can check your vehicle to make sure the PML cover will fit.

2014 and 2015 Silverado and Sierra 1500, please see our new 12 bolt rear cover.

Be aware that for each model and year there may be more than one rear axle possible. See also GM 10 bolt 8½ and 14 bolt 10½ if your stock covers has a different shape or number of bolts.

Fill and Drain Holes and Temperature Sensor Boss

These covers include a fill hole. 2007 and newer vehicles that have a fill hole on their stock cover and must have a fill hole. The fill hole also serves as the level check. A magnetic drain plug is included for use in the drain hole.

On part numbers 9504 and 10303-2, below the fill/level check hole is a boss that can be machined for a temperature sensor. PML has a machine shop and can machine a hole for $45 . Please call to order this option. Let us know if you would like part number 6070 and need a hole for a temperature sending unit.


Installation of PML Cover on 2010 Denali — Part 9504

Leon's Transmissions in Garden Grove, 714-534-3300, installed a black powder coated differential cover on a 2010 GMC 1500 Denali. They also installed one of our new 6L80 transmission pans on the truck.
GMC 1500 Denali with a PML differential cover, extra capacity    PML differential cover getting installed on a 1500 Denali    PML differential cover installed on a GMC 1500 Denali, tire spacing
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Installations of PML Cover on H2 Hummers — Part 10303-2

PML rear end differential cover for Hummer H2 installations are below. The ones one the left and right are black powder coated and the one in the middle is polished. All have been customized with lift kits. The image on the right is courtesy of Scott who also installed and sent us a picture of PML's transmission pan for the H2 installed.
PML rear end differential cover on a Hummer H2, black powder coat finish     PML rear end differential cover on a Hummer H2, polished finish     PML differential cover and transmission pan Hummer H2 installations

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.