GM 7½" and 7 5/8" Ring Gear, 10 Bolt
Differential Cover

P/N 9401

This diff cover fits GM vehicles with 7 1/2" (7.5") or 7 5/8" (7.625") ring gear 10 bolt differential. Typical applications include the following. Be aware that for each model and year there maybe more than one rear axle possible. See also GM 10 bolt 8½.

• Chevy S10, 1983 to 2004
• Chevy S10 Blazer, 1983 to 2004
• GMC S15, 1983 to1994
• GMC Sonoma, 1991 to 2004
• GMC Jimmy, 1984 to 2004
• Chevy Astro Van, 1982 to Current
• GMC Safari Van, 1982 to Current
• Camaro, 1993 to 2002
• Firebird, 1993 to 2002

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. (Yes, this is a pain. However, the bolts and drain plugs are stainless steel and expensive. We do not want our customers to pay extra for several different sizes with each cover.) Here are some guidelines:

• 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.

If you order on-line, 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.

This cover features fill/level check and drain holes for easier maintenance. It also has an undrilled boss for a temperature sensor. The option to have boss drilled and tapped will need to be ordered over the phone, not on-line.

Picture of a Camaro Z28 with this differential cover installed. Note the location of the sway bar to the cover. (Click on image for larger picture.)

Please use the dimensions and check for sway bar clearance before ordering.

This cover can be machined for a temperature sensor. The sensor will be located on the face of the cover and will point toward the rear of the vehicle. See image (click here) for an example. Please call to order if you would like a cover with a temperature sensor location.

Volume:  0.5 qt. over stock

Click here for dimensions. A separate window will open with the dimensions.

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