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Thread: Modern auto into an e12 or e28

  1. #1
    Join Date
    Dec 2017
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    Vancouver, WA
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    Z3 coupe, Z3 Roadster, Z

    Modern auto into an e12 or e28

    I know this is a super bizarre-0 question, but has anyone ever tried to swap a more modern auto trans into an e12 or e28? I've got an e12 with the dinosaur 3 Spd auto. The car is beautiful and my wife really loves it but refuses to drive stick. I have three manual transmission cars, so can't give her s*** about it, I'm just really glad I've got a classic she digs. However, would it be possible to put a 6spd auto from a mid 2000's car in place of what's there now, or am I just out of luck?

    Thanks for the help!

  2. #2
    Join Date
    Apr 2014
    Location
    DFW TX USA
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    1,447
    My Cars
    1983 320I, 1986 325E
    What engine does it have? Maybe you could find something from a e32 (I think it had a m30 in the 1990s) or e34.

  3. #3
    Join Date
    Sep 2009
    Location
    Denver, Colorado
    Posts
    2,876
    My Cars
    1985 535i, 1980 635CSi
    Electronics will be the most difficult to adapt. The easiest being M30B35 as suggested, that transmission and engine will be a step up form what you have, +30hp and +40ft torque, which is about +20% more power. the auto loses a lot, but won't be as bad with the 4 speed. Might depend what diff ratio you currently have too...

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