GM 9.5 14 Bolt, Patterned Fins
Part Number 9504

Volume: 1.0 quart over stock

Dimensions: Click here for dimensions.

Number of Bolts: 14 bolts, see Guidelines for Bolt Sizes (click here), opens in new tab or window

PML makes three covers for the GM 9.5 inch ring gear differential. All three fit the differential. This PML part is designed for GM and Chevy trucks and SUVs looking for an extra capacity differential cover that is only 1/2 inch deeper than stock to clear most spare tires.

Benefits:

• 1 quart of extra fluid capacity
• Drain hole and magnetic drain plug to simplify maintenance
• Fins for heat dissipation and a custom look
• Sand cast aluminum construction for thick walls
• Machined gasket flange for a secure seal

These PML rear end differential covers fit the 14 bolt GM 9.5 inch rear differential. Some possible applications are:

• 1/2 Ton Trucks, 1988 to 2013:
  • C10 & K10
  • C1500 & K1500
  • Silverado 1500 & Sierra 1500
  • Silverado 1500 SS
  • Silverado 1500HD & Sierra 1500HD
• 3/4 Ton Trucks, 1979 to 2004:
  • Avalanche 2500
  • C20 & K20
  • C2500 & K2500
  • Silverado 2500 & Sierra 2500 (not HD)
• 3/4 Ton Vans, 1981 to 2013:
  • Vandura
  • Express
  • Savana
  • G2500
• 1 Ton Vans, 1982 to 1995:
  • Vandura
  • Savana
  • G3500
• SUVs such as:
  • Suburban 2500
  • Blazer K5
• These vehicles usually need PML GM 9.5 H2 cover because of the sway bar:
  • Hummer H2
  • Trailblazer SS
  • SSR
  • Escalade

Configurations vary. Always check your vehicle to verify differential and clearance. For each model and year there may be more than one rear axle possible. Check your stock cover shape and number of bolts. Check for space to spare tires, pan hard and sway bars, and similar, and see Installations for examples.

2014 and newer Silverado and Sierra 1500: please see PML GM 9.5 12 bolt cover.

2010 GMC 1500 Denali

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.
     
Click on an image to view larger in a separate tab or window.

2006 Silverado 1500HD 2WD

One of our shop trucks is a 2005 Silverado 1500HD with a 4L80 transmission and 9.5 14 bolt rear differential. The third picture shows the level check on the differential carrier.

2006 Silverado 1500HD   stock cover   fluid level check on carrier   brake line bracket on PML cover   PML differential cover installed
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Bolt Information

This cover bolts on using 13 of the 14 bolt holes. The bolt hole at the bottom of the cover was removed so that the drain could be centered on the part. This allows for complete draining of fluid. The is no problem with sealing or leaks since the PML cover is heavy duty and does not flex.

PML provides new mounting bolts with each cover. Since GM has used four different bolts for this differential, please specify when ordering which bolts are needed for your vehicle. See Guidelines for Bolt Sizes (click here), opens in new tab or window

Optional Temperature Sensor Port

 Click on image to view larger.

The boss on the side can optionally be machined for temperature sending unit. There is a machining charge and a plug is included.

Fill and Level Check

The fill hole is on the side of the cover at the 3 o'clock position. There is level check hole is on the differential housing. Fill and check the fluid level with this PML cover just like with the stock cover.

Included with this PML Differential Cover

 Click on image to view larger.

PML includes a magnetic drain plug and copper sealing washer, a fill plug and new mounting bolts with each cover.

Inside of Cover

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Matching Front Cover for 4WD

For some vehicles with this rear differential, PML makes a matching differential cover for the front. See PML GM Front 8.5, 10 Bolt.

Gasket Information

PML recommends RTV or paper/fiber gaskets or cork composite gaskets.

PML machines the gasket surface of our differential covers flat. The flange surface of the differential housing is also machined flat. A thin bead of RTV silicon sealant makes an excellent seal between two machined surfaces.

PML Differential Cover Compared to Stock

 
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This image compares the depth of all PML GM 9 1/2, 14 bolt differential covers and the stock cover. Click on image to view larger in a new tab or window.