Technical Rear transverse spring options

So now I have come across something I want to do but looking to see if it has been done or some advice on it.
I have a 26 T coupe that is going to be VERY low static stance car. The frame is a modified 29 Model A frame( boxed and has a 9" z in the rear). I want to keep the cra on transverse spring front and rear. So that being said is anyone running a car front spring on the rear? or how low does the medium arch speedway rear spring set (low point to high point?? )

I really like the idea of running a '40 Ford front spring transverse on top of the rear axle but not sure of how high the spring height would be when mounted.
Any pics or help is greatly appreciated.
Thanks all

 

stock A rear cross?

 

Yes the rear cross member is the stock one, I do have a stock front cross member I could swap in if needed though

 

I have an A frame with an 8in Z in the rear and the speedway medium spring.

 

How low is the back of the car? also how tall is the center of the spring to the top of the axle?
Thanks in advance

 

Doesn't show to well, but you can just see the shackles poking down on each side. Spring mounts from Welder Series on the axle. Rear X-member is a straight tube with the spring mounted under it. Top of spring was approximately 2" above the top of original frame. 3" up travel on each side.



Spring is 41 Merc front with full pack minus the little short one. Leaves smoothed and polished and treated with a special graphite coating between each leaf. Shocks are So-Cal.



Ride was decent for a Model A and still bottomed out on bad bumps (common here on our roads), needs that missing leaf. for 1/4" more lift.

Canuck

 

I have to get my tape measure out, could possibly do it tomorrow. This is what the car looks like.

 

T spring would be a quick solution. the rest would involve fab.

 

I am attracted to using a later model flat style spring in my next T project as a means to leaving a little more trunk space and possibly requiring a little less in the chassis Zed.
I have a T coupe hot rod here, that needs to be rebuilt and it has a flat spring, however it looks to be a Model A front spring, which I fear could be way to hard a ride.

 

behind or above the the rear?

 

Behind the rear.

 

You can not mount a flat style front spring into a high arch rear crossmember.
You can not mount a flat style front spring on top of the rear axle.
These things are physically impossible, and two totally different design concepts.

I like to use the 40 front spring out back, mounted behind the axle with a modified 35-40 rear crossmember. It works very well on narrow builds or wide tire cars, the ride height is very controlled and adjuable based on the modifications to the rear crossmember and it does not bother the trunk floor at all. I reserve the high arch springs only for cars running a quick change rear end.

 

The chassis rear Z depth will be determined in the end by the suspension travel needed above the rear axle, and by the amount you'd like to drop the frame infront of the rear end.

 

I have used 40 front springs on the rear, but the ride quality suffers. I would use the longest spring possible, depending on your width limitations. So Cal has a 2" wide spring that is a little longer, you might check that out.

 

I am open to either above or behind on mine


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Would it need to be the 35-40 rear cross member or would something like a piece od 3x2 box or even a model a front cross member fit into the rear?
I ask about the model a front cross member since I have an extra stock one, I replaced the stock one in the front with one that is flatter and gave the front an extra 1" drop

 

An A front crossmember is too narrow to fit across the frame, and too small for the bigger springs to fit into. If you have a 40 rear crossmember, you could use a 40 front spring and it will have a little wiggle room (not a deal breaker). Mount it behind the axle, there isn't enough arch to put it directly above.

When using those "special" Speedway Motors springs, I'm not sure anybody knows the mounted arch height and perch distance. You will be all on your own.

 

You can use what ever you want, some things work and fit better than others.

The 35-40 cross members are surprisingly quite available. I throw up a want ad and have one in my hands in a week.

There's a bunch of details that work together nicely when you use the right stuff. Pic your battles because there's a bunch of crap that comes along that ain't easy.

 

This is a fairly easy fab if you have basic welding skills.

 

The frame is already z'd in the rear( from the previous setup it had), I am wanting to change that old setup to a traditional type with the transverse spring.
I think I will be using the Speedway spring, I got some dimensions from them and I believe it will work best for the look etc. If I need to I will change the z in the rear to fit my need.

Thanks everyone for input