Technical Model t rear spring

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).

 

BTTT

 

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.

 

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.

 

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.

 

Anyone else that has used a T spring have anything to add?.

 

Here's 3 links on the subject:

http://www.jalopyjournal.com/forum/threads/model-t-spring-in-model-a-rear-crossmember.243999/

http://www.jalopyjournal.com/forum/threads/does-a-model-t-spring-lower-your-model-a.629216/

http://www.jalopyjournal.com/forum/threads/questions-with-a-model-t-rear-spring-help.474514/

 

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



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That's the way I mocked mine up today. Hope it works ok

 

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.

 

How many leaves to use on a t spring on a model a roadster? I took two out and it still rides very hard

 

I make a T-Spring 2.25" wide. I have it posted in the classifieds

 

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

 

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

 

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.