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Customs Advice wanted

Discussion in 'The Hokey Ass Message Board' started by agman345, Jan 20, 2020.

  1. agman345
    Joined: Jan 19, 2020
    Posts: 1


    Im new here and I just purchased my first 1947 plymouth special deluxe. My is question is
    if I place a mopar 6 225 and 904 transmission which I acquired from a 1965 dodge dart 270 , what rear end will I need to complete the set up. Any advice as to the complications or revisions that I may need would welcomed.


    John from Central Pennsylvania
    dana barlow likes this.
  2. goldmountain
    Joined: Jun 12, 2016
    Posts: 4,405


    Welcome here. I had a slant six in my '47 Plymouth and it fits in pretty good but you need a slight notch in the firewall for the head. I used a 9" Ford rear end from a'61 Mercury. Fits good and the spring saddles are even in the right place. A rear end from a Dakota works out good too. The original rear end would hold up but you won't have an emergency brake.

    Sent from my SM-T350 using The H.A.M.B. mobile app
    oldtom69 likes this.
  3. Boneyard51
    Joined: Dec 10, 2017
    Posts: 6,386


    Kinda depends on your driving. The 225 has a lot of torque for its size, so if you drive a lot at high speed a 3 to 1 rear end would be good. But if you want more take off speed or just drive slower, a 3.5 or 3.7 to one might be better.

  4. Get the rear Axle out of the Dart and use it. I would think that gear ratio couldn't get any better.
    dana barlow and Boneyard51 like this.

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 55,637


    Measure first, though, as the Dart rear might be too narrow. And notice the wheel bolt pattern is different.
    Hnstray likes this.
  6. TA DAD
    Joined: Mar 2, 2014
    Posts: 1,095

    TA DAD
    from NC

    The Dart rear end is probably a 7 and 1/4 inch in which case it is one of the weakest ever made and also would have a 5 on 4 inch bolt pattern which there are very few wheels for that pattern.
  7. Ford ranger or explorer 8.8 5x4.5 bolt pattern a little narrower than stock .
  8. Frankie47
    Joined: Dec 20, 2008
    Posts: 1,877

    from omaha ne.

    A 225 won't bust a 7 1/4 rear............but the A body rear is too narrow anyway, you are looking for B body or jeep suv or ford exploder 8.8 they all fit fine. If you move the rad forward of the support you will not need to touch the firewall at all.
  9. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,353

    from Quincy, IL

    Jeep Cherokee ‘91 thru ‘01, is a MOPAR 8.25” which is widely used in various configurations, but the Cherokee has the best combination of width, wheel bolt pattern etc., for your purposes. Six cylinder/automatic Cherokees has 3.55 gears, six cylinder manual are 3.07.

    The Ford Explorer rear axle is popular because it is plentiful, strong and cheap. But it is also heavier and a bit of overkill for your application. A good alternative to that is a Ranger pickup from about ‘92 thru about mid-2000’s. Look for an 8.8”with the 10” brakes, some had only 9”.

    Frankie47 and scotty t like this.
  10. daliant
    Joined: Nov 25, 2009
    Posts: 689


    Is there a usable engine and transmission in this car or is that stuff gone?
    In my opinion putting a slant 6 in one of these cars isn't much of an "upgrade" for the amount of work required, but if that's what you have to work with then it is what it is.

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