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Differential Cover for GM 8.2 Rear, 10 Bolt

Differential Cover for GM 8.2 Rear, 10 Bolt

The GM 8.2 inch rear differential cover is very similar to the GM 8.5, 8.6 differential cover. The bolt pattern is almost the same. About half the bolt holes line up. PML 8.5, 8.6 covers have been modified to fit an 8.2 differential.

We have one GM 8.2 10 bolt cover in stock, in the polish finish, with horizontal fins. Call to order.

Note: Information is for reference only, not recommended or supported by PML. Once modified a cover cannot be returned.

Stock 8.2 cover from a 1966 Pontiac GTO:

Stock cover,
GM 8.2 10 bolt differential, 1966 GTO
Click on image to view larger.


Some Chevrolet, Buick, Oldsmobile and Pontiac 1960s and 1970s muscle cars have this differential.

  • Chevelle
  • Impala
  • Monte Carlo
  • Nova
  • Oldsmobile Cutlass
  • Pontiac GTO

Some vehicles may have a 8.2 or an 8.5 or an 8.875, depending on configuration. GM began using the 8.5 around 1970. The GM 8.875 inch ring gear has 12 bolts while the 8.2 and 8.5, 8.6 have 10 bolts.

Since the size, shape and bolt hole pattern of the 8.2 and 8.5/8.6 are nearly identical, a gasket is an easy way to check if a differential has the 8.2 inch ring gear or the 8.5/8.6 inch ring gear. 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. A customer recommended Felpro Gasket RDS 13410 for a GM 8.2 differential.

Modified PML GM 8.5, 8.6 Differential Covers

These are pictures of PML Gm 8.5, 8.6 differential covers that have been modified to fit a GM 8.2 differential. Several of the bolt holes have been enlarged.

The first 2 pictures show PML Part Number 6082 in the cast finish and the second 2 pictures show PML Part Number 10815 in the black powder coat finish.

PML 6082 with 8.2 holes   close up of home on PML 6082 with 8.2 holes   PML 6082 in black powder coat with 8.2 holes   PML 10815 with 8.2 holes
Click on image to view larger.

Our customers have reported that the bolts used the GM 8.2 have been 5/16-18 x 7/8 inch.