GM 8.5" & 8.625" RING GEAR, 10 BOLT DIFFERENTIAL COVERS

PML offers two rear differential covers for GM 8 1/2-inch and 8 5/8-inch ring gear, 10 bolt applications. The two covers are the same except for the fin pattern and P/N 10815 has a boss for a temperature sensor and a fill hole. These covers will not fit the 10 bolt 8 1/2" front axle.

 ½ Ton Trucks, 1979 to Current:

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

¾ Ton Trucks, 1979 to 1998:

• C20 & K20
• C2500 & K2500

½ Ton Vans, 1979 to Current:

• Vandura
• Express
• Savana
• G1500

¾ Ton Vans, 1979 to Current:

• Vandura
• Express
• Savana
• G2500

Full Size Blazer & GMC Jimmy, 1982 to 1994

Avalanche 1500

Tahoe & Yukon, 1992 to Current

Suburban 1500, 1979 to Current

Hummer H3

The boss on the side of P/N 10815 can optionally be machined for temperature sensor for $35 additional (call to order machining and let us know your sensor thread size).

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.

• Metric bolts will have 1.25 threads per mm (20 threads per inch), standard ones will have 18 threads per inch. 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.
• Bolt length is measured from the underside of the head (where a washer would sit) to the tip. If the bolts are metric, the length will be 21mm or 16mm. If the bolt is standard, the length will be 5/8 inch or 7/8 inch.

So there are four different bolts possible with these differentials. Be sure to order the correct one for your vehicle. When you look at the ordering selections below, the last number is the length and the middle number is the threads per inch or mm.

When you get your cover, it will include bolts that are longer than the stock bolts since the flange on PML's cover is much thicker than stock. Our bolts are 3/8-inch or 9mm longer than stock bolts. The bolts with the stock cover will not work.

Volume: 0.5 qt. over stock

For dimensions of P/N 9330, click here. For dimensions of P/N 10815, click here. A separate windows will open. The data may take a minute to load.

P/N 9330 in as-cast finish
Price for as-cast finish: $155.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16inch-18x7/8 bolts:

5/16inch-18x5/8 bolts:

P/N 9330 in black powder coating
Price for black powder coating: $195.00

8mm-1.25x21 bolts.

8mm-1.25x16 bolts:

5/16in-18x7/8 bolts:

5/16in-18x5/8 bolts:

P/N 9330 in polished finish
Price for polished part: $265.00

8mm-1.25x21 bolts.

8mm-1.25x16 bolts:

5/16inch-18x7/8 bolts:

5/16inch-18x5/8 bolts:

P/N 10815 in as-cast finish
Price for as-cast finish: $155.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16inch-18x7/8 bolts:

5/16inch-18x5/8 bolts:

P/N 10815 in black powder coating
Price for black powder coating: $195.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16inch-18x7/8 bolts:

5/16inch-18x5/8 bolts:

P/N 10815 polished finish
Price for polished part: $265.00

8mm-1.25x21 bolts:

8mm-1.25x16 bolts:

5/16inch-18x7/8 bolts:

5/16inch-18x5/8 bolts:

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 reuseable gasket
• Oil changes without removing the cover
• All hardware provided, including magnetic drain plug