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PML Differential Cover for GM 8.2 10 Bolt

PML makes differential covers for the GM 8.2 10 bolt rear axle by machining the bolt holes on our GM 8.5/8.625 covers. By adjusting the size of several bolt holes, both PML 8.5/8.625 differential covers can fit on a GM 8.2 differential.

PML 8.5 differential cover machined for GM 8.2 differential   PML cover
		for GM 8.2 10 bolt differential, vertical fins
Images show PML covers for GM 8.2 10 bolt rear differentials. Click on image to view larger.

For PML to make a GM 8.2 cover, there is a custom machining charge. Contact PML for pricing and turn around time, 310-671-4345. Custom machined parts cannot be returned or exchanged. This would be a final sale.

The shape, size and bolt hole pattern of the 8.5/8.625 10 bolt stock differential cover is nearly identical to the cover for the GM 8.2.


Many 1964 to 1972 GM, Buick, Olds, and Pontiac cars and vans use the GM 8.2 ring gear and may be able to use a PML differential cover. Installer or mechanic must check clearance, fit and function.

Examples of vehicles with the GM 8.2 inch ring gear rear differential that have installed a PML rear differential cover:

  • 1966 Impala
  • 1960s Chevelles
  • 1966 Pontiac GTO
  • 1966 Oldsmobile Cutlass
  • 1970 Nova

Some 1960s and 1970s cars used a 12 bolt GM 8.875 inch ring gear instead of the 8.2 so be sure to check your configuration.

GM began using the 8.5 instead of the 8.2 around 1973.

Since the size, shape and bolt hole pattern of the 8.2 and 8.5/8.625 are nearly identical, a gasket is the best way to check if a differential has the 8.2 inch ring gear or the 8.5/8.6 inch ring gear if you are unsure.

For example, a GM 8.5/8.625 gasket for a 1998 Silverado 1500 would not have quite the same bolt hole pattern when placed on an 8.2 differential.

GM 8.2 Differential Cover Gasket

A customer provided Felpro gasket part number 55028 for reference for his 1966 Chevelle with the 8.2.

Level Check

Use the level check on the differential. the level check hole on the PML covers may not be at the same relative location. The fill/level check holes on the PML cover correspond to the GM 8.5/8.625 differential.

Stock Covers

Stock covers from a 1966 Pontiac GTO shown with PML 8.5 inch differential cover. Click on image to view larger. There may be other stock covers that GM used.

The first cover is on a 1970 Nova. The second cover is from a 1966 Pontiac GTO.

GM 8.2 10 bolt differential, 1970 Nova     Stock cover,
		GM 8.2 10 bolt differential, 1966 GTO
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1965 Pontiac GTO 8.2 Ring Gear

PML machined the bolt hole pattern for the GM 8.2 differential for this customer's 1965 Pontiac GTO.

1965 GTO, has 8.2 inch ring gear differential 1965 Pontiac GTO   1965 GTO with PML GM 8.2 rear differential cover PML cover just visible on GTO   PML differential cover installed on 1965 Pontiac GTO PML cover installed
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