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PML Differential Cover for GM 8.2 10 Bolt

Some GM cars in the 1960s and 1970s have the 10 bolt GM 8.2 inch ring gear rear differential.

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

PML 8.5 differential cover next to GM 8.2 inch 10 bolt stock cover

Stock cover from a 1966 Pontiac GTO shown with PML 8.5 inch differential cover

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The bolt pattern is not quite the same. To get the PML cover to fit, the holes at 6 o'clock and 12 o'clock were enlarged.

PML 8.5 differential cover with two enlarged holes

The holes at the top and bottom were enlarged to fit a 1966 GTO.

Click on image to view larger.

The PML cover is part number 10815. PML makes two covers for the GM 8.5 with different depths and styles. See comparison of PML 8.5 rear covers for pictures and more information.

There may be other stock covers that GM used.

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 8.5 inch cover with the holes enlarged. Installer/mechanic must check fit and function.

Some models during these years 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.

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