RPOARCHIVE
Loading index…

    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    M-38 / M-40 Factory-verified

    Oldsmobile · Regular Production Option

    TH-350 / TH-400

    Years 1970, 1973–75 Models 1 Factory citations 1

    Documented applications

    Cutlass / 4-4-2
    • 1970 Factory-verified

      JO-code TH-350 on W-31 auto; OW TH-400 on W-30. Factory list: both "Turbo-Hydra-Matic Transmission" (M-38 = 350 CID engines, M-40 = 455 CID)

      GM Heritage factory kit — 1970 Oldsmobile 442 Info Kit, p.229.
    • 1973–75 Confirmed

      Engine-dependent

    Related codes · mentioned in these notes

    M-38M-40W-30W-31

    This page aggregates every documented appearance of M-38 / M-40 in the Oldsmobile reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.