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GM 8 7/8" Ring Gear (Truck), 12 Bolt, Differential Cover

Part Number 6058 (was Part Number 10277)

PML GM Truck Diff Cover, as-cast PML GM Truck Diff Cover, black powder coat PML GM Truck Diff Cover, polished
As-cast finish
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Black powder coating
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Polished finish
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Volume: 1.0 qt. over stock

Dimensions: Click here for dimensions. Depth inside is 4½ inches.

This differential cover fits GMC and Chevy trucks and SUVs with the GM 8 7/8" (8.875") ring gear 12 bolt differential. Typical applications include ½ and ¾ ton vehicles with 2 or 4 wheel drive made by Chevrolet and GMC from 1963 - 1991. These trucks and SUVs came with options for different differentials so please check before ordering. Some common applications for this rear end cover are:

  • C10 & K10, 1967-1976
  • C20 & K20, 1973-1976
  • Chevrolet Blazer, 1969 to 1976
  • GMC Jimmy, 1969 to 1976
  • Suburban 10/1500, 1973-1981
  • Suburban 20/2500, 1973-1991


Read about an install of this cover on a 1972 Chevrolet C-10 in Classic Trucks magazine.

1972 C-10 Cheyenne

Bruce installed this PML differential cover on his 1972 Chevy C-10 Cheyenne with a 350 ci engine and 700R4 transmission.

PML rear axle cover installed on a 1972 Chevy C10    Close up of PML differential cover installed on a 1972 Chevy C10    Close up of stock cover PML cover for 12 bolt GM Truck differential    Side view of PML cover installed on a 1972 C10
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PML cover installed on a 1978 Chevy C10

1978 Chevy C10

Stephen installed this PML differential cover on his 1978 Chevy C10.

Stephen said that changing out the stock cover for a PML heavy duty cover is " a good practical upgrade". Our thanks to him for choosing PML for his truck.

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PML Differential Cover Features:

  • Increased oil capacity for cooler temperatures
  • Sand-cast aluminum with raised fins
  • Thick wall construction to add strength to differential housing
  • 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.