PML GM 8½" and 8 5/8" Ring Gear, 10 Bolt  Vertical Fins, Differential Cover - CJC Off Road
PML GM 8½" and 8 5/8" Ring Gear, 10 Bolt  Vertical Fins, Differential Cover - CJC Off Road
PML GM 8½" and 8 5/8" Ring Gear, 10 Bolt  Vertical Fins, Differential Cover - CJC Off Road

PML GM 8½" and 8 5/8" Ring Gear, 10 Bolt Vertical Fins, Differential Cover


Regular price $255.00 Save $-255.00

0 in stock

Click on the button under the bolt size you need to order the differential cover. Scroll down for more information on bolts.

Volume: 0.5 qt. over stock, approximately

Dimensions: Click here for dimensions. A separate window or tab will open.

PML makes two differential covers for the GM 8 ½, 8 5/8 inch 10 bolt rear end. To see both options, go to both PML GM 8½" differential covers.

Applications for a PML GM 10 Bolt Differential Cover

This PML differential cover fits the rear end differential on many GM, GMC, and Chevrolet vehicles. 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 7.5 and GM 14 bolt 9.5.

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, 1977 to 1994

GMC Jimmy, 1977 to 1991

Escalade, Tahoe & Yukon, 1992 & newer
(check for panhard bar)

Avalanche 1500

Suburban 1500, 1982 to current

Hummer H3

GM 8.2 10 Bolt: These rear end covers can also fit on older vehicles with the GM 8.2 differential. For example:

  • 1966 Impala
  • 1960s Chevelle
  • 1966 Pontiac GTO

See our GM 8.2 web page for more information.

GM 8.2 with PML cover
PML GM 8.5 cover and stock GM 8.2 cover

4WD Front Applications: Note that these covers will not fit the front axle 10 bolt 8 1/2" ring gear differential found on some 4WD Chevy and GMC SUVs and trucks.

Temperature Sensor Port Option

The boss on the side can optionally be machined for temperature sensor for $40 additional (call to order machining and let us know your sensor thread size).

Bolt Information

PML includes mounting bolts with all differential covers. PML provides bolts that are longer than the stock bolts since the flange on PML's cover is much thicker than stock. The bolts with the stock cover will not work.

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. 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.
  • 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.

Gasket Information for a PML GM 10 Bolt Differential Cover

PML machines the gasket surface of our differential covers completely 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. If you prefer to use a gasket, we have had customers recommend the Fel-Pro RDS 55028-1 gasket.

Matching Front Cover for 4WD

For 4WD trucks and SUVs with the GM 8.5, 10 Bolt front end, PML offers a matching differential cover.

See the GM 8 1/2, Front 10 Bolt, Part Number 6077

The matching front cover is available in all finishes. Shown in black powder coated.

PML matching front cover

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

Learn more about finishes and construction of PML parts.

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