GM 9½" Ring Gear, 14 Bolt
Differential Cover

P/N 9504

As-cast finish
$190.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16in-18x7/8 bolts:

5/16in-18x5/8 bolts:

Black powder coating
$235.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16in-18x7/8 bolts:

5/16in-18x5/8 bolts:

Polished finish
$300.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16in-18x7/8 bolts:

5/16in-18x5/8 bolts:

This diff cover fits the rear end on the GM Corporation 9½" 14 bolt differentials used on many Chevy and GMC trucks, vans and SUVs. Typical applications include the following. 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.

  ½ Ton Trucks, 1988 to 2006:

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

¾ Ton Trucks, 1979 to 2006:

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

¾ Ton Vans, 1981 to 2006:

• Vandura
• Express
• Savana
• G2500

1 Ton Vans, 1982 to 1995:

• Vandura
• Savana
• G3500

Suburban ¾ Ton: 1988-2006

Avalanche

You can also use PML's diff cover part number 10303-2. Part number 10303-2 has a fill hole and less capacity (0.5 qts. over stock) compared to this cover (1.0 qts. over stock).

For the Hummer H2, you must use part number 10303-2. This diff cover will not work for you.

For 2007 and newer vehicles with fill holes on the stock covers, do not order this diff cover! Order PML diff cover part number 10303-2. If your stock cover does not have a fill hole, this cover (part number 9504) will work.

Note: GM has used four different bolts on these differentials so to complete your order, we need to know which bolts you have. These differentials have used both metric and standard cover bolts. The bolt length has not been consistent either. When ordering one of these covers, you will need to pull one of your stock bolts out (a top bolt is best) and measure the length and determine whether it is metric or standard.

• Bolt length is measured from the underside of the head (where a washer would sit) to the tip.
• Metric bolts will have 20 threads per inch, standard ones will have 18. Also, a bolt head with lines or letters on it is typically standard. A bolt with numbers such as 5.8, 9.8, 10.9, or 12.9 is likely to be metric.

We know this is a hassle, but we do not want to send the wrong bolts or charge everyone a lot of extra money to cover sending all possible bolts with each cover.

Volume:  1.0 qt. over stock

Click here for dimensions.

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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