GM 9½" Ring Gear, 14 Bolt
Differential Cover
With Oil Fill/Level Check Hole

P/N 10303-2

This diff cover fits the rear end on the GM Corporation 9½" 14 bolt differentials used on Hummer H2 and many Chevy and GMC trucks, vans and SUVs. This cover is very similar to PML part number 9504 and it fits all the vehicles that can use part number 9504. This cover can also work on 2007 and newer GM and Chevrolet trucks and vans and Hummer H2. The difference between the two PML 9½ GM rear end covers is that part number 9504 does not have a hole for level check/oil fill and it has 1 quart over stock capacity. Part number 10303-2 does have a hole for level check/oil fill and has ½ quart over stock capacity. Also, part number 10303-2 has a boss that can optionally be machined for a temperature sensor.

Typical applications for this cover 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 Current:

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

¾ Ton Trucks, 1979 to Current:

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

¾ Ton Vans, 1981 to Current:

• Vandura
• Express
• Savana
• G2500

1 Ton Vans, 1982 to 1995:

• Vandura
• Savana
• G3500

Hummer H2

Avalanche

Trailblazer SS

Suburban 2500, 1980-Current

Chevrolet SSR (6 speed)

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.

Please note the length of your stock bolts, and whether they are standard or metric in the vehicle information section when placing your order so we can provide the correct bolts. 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:  0.5 qt. over stock

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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