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Old 11-08-2007, 04:07 PM
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Rear X-Member with Coil overs/tri-4bar/-loaction/angles

OKay, this is for my '36 Ford PU....hope the title/subject made sense.

I'm putting in a Tri-4bar setup, I have the lower mounts in and the axle centerline looking good, I need to fab up another set of upper mounts...but, before I get to that I'd like to put in my rear crossmember for the shock mounts (I need to do this first, so to get the correct frame spread and re-center the axle), I need a general idea of:

How far behind the axle should the X-member be (I've never had a coilover shock in my hand, so not sure what to expect). I kinda think about 6-inches should be good?

And also, what would be a good angle for the shocks to mount at...maybe a 15-20 degree tilt in to center?


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Old 11-08-2007, 05:25 PM
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Go Here for more info about rear suspensions than you may want to the coil overs as vertical as possible and as far outboard as possible according to what is doable..

When you order your coil overs order the weld-on brackets for them to attach to the axle..Once those are in place the position of the rear x-member becomes apparent..

I have tried most all of it and now do what is known to work..

Last edited by OneMoreTime; 11-08-2007 at 05:26 PM. Reason: spel check
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Old 11-08-2007, 05:51 PM
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Rear X- Member with coil overs

I have used QA1 coil overs and they are 3" dia. Check, type in coil over shocks and scroll down to QA1 shocks. There is an application chart under each shock listed.

For set up ,I made a strut. I took a piece of 1" tubing and welded a 1/2" nut on one end and a piece of 1/2" I.D. dom on the other end. Then another piece of the dom on to a length of 1/2" threaded rod. Around the 1" tube I coiled up a piece of 3/8 rod and a couple of 3" dia. plates. With this I can set my ride height, mounts and axle / crossmember stand offs. The struts won't compress making it easier to do your set up. I would use the mounting kit they offer.

20* is the recommended angle for the shocks.

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Old 11-09-2007, 08:07 AM
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Thanks folks.

My lower bar mounts have the shock mounts on them already.

Might be best to get the coil overs first I guess, before locating the crossmember...I was hoping for an easy way out
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