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Best 5 Speed for Cadillac Flathead?

Discussion in 'The Hokey Ass Message Board' started by 38FLATTIE, Feb 18, 2010.

  1. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,349

    38FLATTIE
    Member
    from Colorado

    I had planned on using one of my Lasalle 3 speed trannies behind the Cadillac Flathead.

    Now I'm thinking I would be better off with a 5 speed. The Lasalle ****** has what looks to be a rather long shaft. Has anyone done this?

    Any suggestion as to which ****** to use with a modified stock bellhousing?
     
  2. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,349

    38FLATTIE
    Member
    from Colorado

    Someone must have an idea, or maybe has done this before?
     
  3. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,349

    38FLATTIE
    Member
    from Colorado

    Bump for the day crew
     
  4. Fiddytree
    Joined: Sep 7, 2008
    Posts: 204

    Fiddytree
    Member
    from Durango

    Ha, I don't know snot, but here's what I think . . .

    Any T-5 should hold the flathead power. A "WC" (world cl***) would be best.

    I "think" the ford use a long input shaft. Hopefully someone will chime in for you.

    Wish you the best, it'll be a great ride!
     
  5. AnimalAin
    Joined: Jul 20, 2002
    Posts: 3,416

    AnimalAin
    Member

    I'd say that a T5 would probably be the best bet. They are available, have several available ge****ts, and are strong enough for a flathead-powered car (even a Cad). The weight of your car might be an issue, but I doubt that you'll have problems unless you deliberately try to break the transmission.

    Not sure about the adaptation issues, but Flat Ernie's thread on T5s probably has some of the data you need. I would guess that a WC transmission from a V8 Mustang (3.35 low gear) is worth considering. I think its gear spreads would be a good match to the torque curve of your flathead, and has the bonus of being available and widely supported by the factory and aftermarket.

    You have a very interesting project going; inspirational and creative. Please keep us updated.
     
  6. Q
    Joined: Aug 13, 2005
    Posts: 603

    Q
    Member Emeritus

    Try Bendtsen's Transmission Adapters http://www.transmissionadapters.com

    Cadillac to Chev Auto or Manual
    346 Flathead* $ 795.00


    Then you find yourself a T-5 from a Camaro!
     
    Last edited: Feb 21, 2010
  7. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,349

    38FLATTIE
    Member
    from Colorado

    I'll look into the T5.

    I'm a little leary of the adapter, as I've only heard negative feedback about them.

    Has anyone used one with good results?
     
  8. 38FLATTIE
    Joined: Oct 26, 2008
    Posts: 4,349

    38FLATTIE
    Member
    from Colorado

    I sent them an email, but I'm not sure about that setup- look closely at the second pic.

    It appears with their adapter, that you keep the stock flywheel, then add a SECOND flywheel behind the first. I'm not thrilled by that prospect.
     

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