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Thread: diff oil?

  1. #1

    diff oil?

    What would be the recommended diff oil for a 67 Riviera GS and it has the Pos i rear end?
    1967 Riviera GS 430

  2. #2
    You will need an 80-90 type oil suitable for use in GM posi-trac diffs. Your local parts dealer should be able to recommend one.

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