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

Part Number 6082

PML makes two differential covers for the GM 8½, 8 5/8 inch 10 bolt rear end. See both PML GM 8½" rear differential covers to compare.

Differential Cover, GM 8.5 10 bolt Differential Cover, GM 8.5 10 bolt Differential Cover, GM 8.5 10 bolt, polished

As-cast finish

8mm-1.25x21 bolts: Go To Cart

8mm-1.25x16 bolts: Go To Cart

5/16in-18x7/8 bolts: Go To Cart

5/16in-18x5/8 bolts: Go To Cart

Black powder coating

8mm-1.25x21 bolts: Go To Cart

8mm-1.25x16 bolts: Go To Cart

5/16in-18x7/8 bolts: Go To Cart

5/16in-18x5/8 bolts: Go To Cart

Polished finish

8mm-1.25x21 bolts: Go To Cart

8mm-1.25x16 bolts: Go To Cart

5/16in-18x7/8 bolts: Go To Cart

5/16in-18x5/8 bolts: Go To Cart

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.

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. Be aware that for each model and year there may be more than one rear axle possible. See also GM 10 bolt 7.5, GM 14 bolt 9.5, and GM 12 bolt 9.5.

Typical applications for this differential include the following:

  • ½ Ton Trucks, ½Vans and ¾ Vans, 1979 to Current:
    • C10 & K10
    • C1500 & K1500
    • Silverado 1500
    • Sierra 1500
    • Vandura
    • Express & Savana
    • G1500 & G2500
  • ¾ Ton Trucks and Vans, 1979 to 1998
    • C20 & K20
    • C2500 & K2500
  • Chevy and GM SUVs
    • 1977 to 1994 Full Size Blazer
    • 1977 to 1991 Jimmy
    • 1982 to Current Suburban 1500
    • 1992 to Current Avalanche 1500, Escalade, Tahoe, Yukon (check panhard bar clearance)
    • Hummer H3
  • 2002 to 2012 Colorado (some,  with 5.3L), see also Torsen 10 Bolt Cover
  • 1970s Cars such as Chevelle, GTO, Impala, Monte Carlo, Nova

Configurations vary. Always check your vehicle to verify differential and clearance. Police vehicles generally have less clearance.

GM 8.2 with PML cover

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.

PML GM 8.5 cover with horizontal fins and stock GM 8.2 cover show together. Bolts hole locations at 6 and 12 o'clock are slightly different.

4WD Front Applications: See PML Part Number 6077 for GM Front 10 bolt 8 1/2" ring gear differential found on some 4WD Chevy and GMC SUVs and trucks. PML part number 10815 and 6082 are for the rear differentials.

Temperature Sensor Port Option

The boss on the side can optionally be machined for temperature sensor for $45 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.
    Standard bolt, 1 inch long    Metric bolt, 30mm long
    These images show how to measure the bolt length. Click on small image to view larger in a new tab or window.
  • 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.
  • Metric bolts will have 20 threads per inch. Standard ones will have 18 threads per inch. Since the bolts do not have a full inch of threads, try counting the number in a half an inch and multiply by two.

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. Watch the video for more informations on checking your bolts.

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

PML Differential Cover Compared to Stock

PML Differential Cover Part Number 6082 height compared to stock  PML Differential Cover Part Number 6082, compared to stock
Click on image to view larger.

These images show this PML differential cover compared to the stock cover.

This image compares the depth of both PML GM 10 bolt differential covers and the stock cover. Click on image to view larger in a new tab or window.
PML GM 10 bolt Differential Covers depth comparisons


Installation on a 1993 Chevy Silverado

Damon installed this PML 10 bolt rear differential cover on his 1993 Chevy Silverado 6.3L 383 SS truck. Both his truck and his dog are ready to go for a ride.

From left to right:
Supplies for installation, adding fluid, PML cover installed, 1993 Silverado with PML cover
Supplies needed by Damon for installing PML cover on his Silverado   Adding fluid PML differential cover   1993 Silverado with PML GM 10 bolt differential cover   1993 Chevy Silverado and a happy dog
Click on image to view larger.

Installation on a 1996 Impala SS

Installation and video by Hoagie's Garage. This Impala had oem bolts size 5/16in-18x7/8 bolts on the stock diff cover. Thanks to Hoagies Garage for the images and a great video.

1996 Impala 1996 Impala SS   1996 Impala, PML differential cover PML differential cover on a 1996 Impala   Clearance on an Impala to PML cover Plenty of space behind PML rear differential cover on a 1996 Impala SS   PML GM 10 bolt rear differential cover drain shown on an Impala Drain on PML 10 bolt GM rear differential cover on a 1996 Impala. Magnetic drain plug included with cover.
Click on image to view larger in a new tab or window.

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.