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Technical Model t rear spring

Discussion in 'The Hokey Ass Message Board' started by 1oldtimer, May 24, 2014.

  1. I had the page bookmarked but it got lost in the shuffle. Is there a problem mounting a T rear spring in an A rear crossmember contour wise. I can twist the frame a little depending on how I tighten the rear clamps (in what order and how hard).
     
  2. The T spring is not as wide as the A spring. You will need to fabricate a shim/spacer to firmly mount the T spring in the A crossmember.
     
  3. flthd31
    Joined: Aug 5, 2007
    Posts: 584

    flthd31
    Member

    Yes, there is a much different contour on the "T" vs "A" crossmembers.
    "T" has a much higher arch in it as shown in the pic.
    You could possibly tighten the snot out of the U bolts and get it up there (or crack the crossmember) but the torque required would be tremendous. The A crossmember could fail at some point down the road under such tension.
    A simple fix is to tack a couple of spacers on top the "T" spring to compensate for the difference (see pic). Having an "A" spring for a pattern would help get it right or make a pattern from the inside of your 'A' crossmember.
    Seems most HAMBers don't bother with this and aren't aware that the T crossmember is quite a bit different from an A crossmember. The pic of the "T" crossmember is from Thunderbirdesq roadster build.

    T and A rear crossmember.jpg spring_017.JPG
     
    bct likes this.

  4. I did notice that it was touching the center of the leaf only inside the crossmember. I knew about the spacers for the width but didn't see any post or talk about the contour difference. I have both but wanted to use the T spring to lower it, maybe I'll play with removing leafs on the A spring.
     
    Last edited: Aug 19, 2014
  5. Anyone else that has used a T spring have anything to add?.

    [​IMG]
     
    Last edited: Aug 19, 2014
    HemiIn34 likes this.
  6. flthd31
    Joined: Aug 5, 2007
    Posts: 584

    flthd31
    Member

  7. Meyer
    Joined: Sep 9, 2007
    Posts: 379

    Meyer
    Member

    What about replacing the top T leaf with the top leaf from an A spring? Would help contour and movement front to back also.



    Posted using the Full Custom H.A.M.B. App!
     
  8. 31ster
    Joined: Dec 26, 2007
    Posts: 215

    31ster
    Member

    That's the way I mocked mine up today. Hope it works ok
     
  9. Here's the 2 rears (model A and model T) together, it's about 1 leaf thickness difference were the u bolts are. You can also see why the T spring lowers it.
    rear springs-1.jpg
    rear springs-3.jpg
    rear springs-5.jpg
    rear springs-4.jpg
     
  10. ROBERT JAM
    Joined: Nov 13, 2002
    Posts: 1,261

    ROBERT JAM
    Member

    How many leaves to use on a t spring on a model a roadster? I took two out and it still rides very hard
     
  11. 100% Matt
    Joined: Aug 7, 2006
    Posts: 2,747

    100% Matt
    Member

    I make a T-Spring 2.25" wide. I have it posted in the classifieds
     
  12. dualquads
    Joined: Apr 9, 2012
    Posts: 86

    dualquads
    Member


    I used the same method as this on my A coupe with a T spring, if you don't when you climb in the car rolls to the drivers side quite badly, welding the small wedge shapes made the car sit very level.

    Kev
     
  13. z28michael
    Joined: Dec 1, 2010
    Posts: 16

    z28michael
    Member

    I'm using a reverse eye T in a model A frame and placed a modelA top leaf on the T spring to fit the A crossmember. Any thoughts on how it will work? Thanks
     
  14. 1ton
    Joined: Dec 3, 2010
    Posts: 687

    1ton
    Member

    If the T crossmember has a higher arch then would it help to replace the A crossmember with a model t member? Might help lower the car some more as well.
     

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