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type a overdrive

  1. T

    TR2/3/3A Type A Overdrive, Physical Differences between Roadster Brands?

    Excepting the ratio difference for some applications (28% for Jags vs. 22% for others?), was there any physical difference in the Type A sports overdrives between those used in TRs, Austin-Healey, MG, etc.? Or are the differences only in the rear casing dimensions? I know the sedans are a...
    • Tropical TR
    • Thread
    • austin healey mgs tr3 type a overdrive
    • Replies: 2
    • Forum: Triumph
  2. T

    TR2/3/3A Type-A Overdrive Handling Differences

    Gentlemen, As part of my TS52910L rebuild, I'm looking to add an overdrive. I understand there were perhaps three changes to the A-type used from TR3 to TR250/early TR6, that these dealt mainly with the accumulator piston sizes and that piston size affects how smoothly the OD engages? Someone...
    • Tropical TR
    • Thread
    • tr3 type a od type a overdrive
    • Replies: 9
    • Forum: Triumph
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