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Automatic o/d tranny for an M5

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  • Automatic o/d tranny for an M5

    This is a long shot, but does anyone out there in Studedom have any experience with putting an automatic transmission with an over-drive ratio behind a Stude Champion engine?

    Any thots/suggestions (besides permanent "funny farm" residence)?

    If it worked, it would solve city drivability and highway crusing speed problems in, say, an M5. A gent not far from me has an old GM 4 speed Hydramatic behind the original 4 cylinder engine in a '32 F**d Model B roadster - and it works just fine! Where there's a will, there's a way!

    Roger "153624" Hill

    55 Champion
    47 M-5
    Izzer Buggy
    Junior Wagon
    Roger Hill


    60 Lark Vlll, hardtop, black/red, Power Kit, 3 spd. - "Juliette"
    61 Champ Deluxe, 6, black/red, o/d, long box. - "Jeri"
    Junior Wagon - "Junior"

    "In the end, dear undertaker,
    Ride me in a Studebaker"

  • #2
    I was working on an adapter to a Ford A4LD, but the SBF flywheel is a lot closer to the champ pattern and the AOD is a lot more plentiful.

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    • #3
      Turns out I have a 5.0 stick bell that I can use to dial in the adapter plate design. The AOD has a 3.07 first gear and about a .7 OD. But most AOD's are going to have a lower stall than what would be appropriate for a 170, I think, depends on weight. Maybe the gear engagement wouldn't be harsh with a mustang convertor.

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      • #4
        Incorrect first gear ratio on that AOD. more like 2.5 and some had 2.8

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