62-72 (Shorter) Torsion Bars in a 73-74????

1971 - 1974 Mopars

  1. 74Beeper

    74Beeper Well-Known Member

    Messages:
    222
    Likes Received:
    140
    Joined:
    Aug 15, 2015
    Location:
    Fargo, ND
    Local Time:
    5:35 PM
    I was wondering if anyone has completely ditched the bolt in torsion bar crossmember in a 73-74 and welded the hexes into the transmission mount crossmember in the chassis so you could run the shorter 62-72 torsion bars???

    I know this has been done by people and i'm wondering what their process was to do it. The reason for my asking is i'm fixing to do a T-56 Magnum conversion and this transmission is much longer and the torsion bar crossmember will more than likely be right in the way of the tail shaft and the new trans mount.

    My simple mind says all i'd have to do is cut the internal hexes from the old crossmember and weld them into the trans crossmember that's part of the chassis...... But, my simple mind has gotten me in a bind more than once and would greatly appreciate any ones experience with this modification.....

    Thanks,
    JJ Crossmember.JPG
     
  2. Kernel Sanders

    Kernel Sanders Well-Known Member

    Messages:
    795
    Likes Received:
    201
    Joined:
    Dec 13, 2008
    Location:
    Ottawa, Ontario, Canada
    Local Time:
    6:35 PM
    I thought about doing this when I replaced the bent up torsion cross member from my 74. I ended up NOT doing it and had steel bushings made to replace the rubber bushings to make it solid with my replacement cross member.

    However I did remove the hex torsion bar anchors from my twisted up garbage cross member and found they will fit and sit perfectly in the transmission cross member where the longer torsion bars go through it. But I DIDNT measure the distance from the control arm pivot torsion socket to the 'relocated' anchor to say yay or nay to the conversion to the shorter bar.

    If you do the measurement please let me and us here know if it will work for the shorter 72 and back bars.

    The 73 and up bars are 43.6" long vs the 72 and prior bars 41"
     
  3. 74Beeper

    74Beeper Well-Known Member

    Messages:
    222
    Likes Received:
    140
    Joined:
    Aug 15, 2015
    Location:
    Fargo, ND
    Local Time:
    5:35 PM
    There is a feller on my 73-74 Facebook group who did this conversion. He said he just cut out the hexes from the member, clocked them perfect, welded them into the trans member and used the shorter 62-72 bars. He also said that the 73-74 cars still retained the floor reinforcements found in the earlier cars so doing this conversion is as simple as welding in the hexes.
     
    • Like Like x 1
    • WP29440SE

      WP29440SE Well-Known Member

      Messages:
      3,688
      Likes Received:
      2516
      Joined:
      Dec 7, 2011
      Location:
      Englewood CO
      Local Time:
      4:35 PM
      it seems to me that the bars would be somewhat testy to install as the lower control arms sit a couple inches lower because of the k frame isolation bushings. the bars would now be at angle and put a side load on them? with them being shorter would also complicate things. I have never done this but I have also contemplated the idea
       
    • 74Beeper

      74Beeper Well-Known Member

      Messages:
      222
      Likes Received:
      140
      Joined:
      Aug 15, 2015
      Location:
      Fargo, ND
      Local Time:
      5:35 PM
      I see where you're going with that idea but the hole in the cross member where the bar passes through is aligned. All that needs to be done is weld in the hex bungs in from the torsion bar member
       
      • Thanks! Thanks! x 1
      • Nacho-RT74

        Nacho-RT74 Well-Known Member

        Messages:
        3,225
        Likes Received:
        1018
        Joined:
        Oct 8, 2012
        Location:
        Caracas, Venezuela
        Local Time:
        6:35 PM
        The T bars go through the unibody crosmember hole centered, SO the isolation shouldn't be affecting the vertical aligment.
         
        • Thanks! Thanks! x 1
        • WP29440SE

          WP29440SE Well-Known Member

          Messages:
          3,688
          Likes Received:
          2516
          Joined:
          Dec 7, 2011
          Location:
          Englewood CO
          Local Time:
          4:35 PM
          I didn't really get under there and study it , I was going on what I remembered when I was rebuilding the front end , I guess I remembered incorrectly lol
           
        1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
          By continuing to use this site, you are consenting to our use of cookies.