You can also just restore your pitted differential cover. Unless it's severely bad, just fill the pits with products like Permatex 25909; Evercoat Metal 2 Metal; USC All Metal... Diff cover is thick enough that you can even weld or braze new metal into the pits and then just grind down and paint. What's pitted? The outside where it's cosmetically bad, or the sealing surface?
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1979 Trans Am W72 400/4-Speed WS6 - Starlight Black Hardtop
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