http://www.mustangsteve.com/underrides.html

I have a page with all that info.  The bolts are 5/8" as are the bushing ID.  Disregard the bushing ID on the drawing.

I no longer have these on my car.  The Shelby design has the rear suspension always in a bind, limiting travel unless the spring is forced to wrap up.  It makes the car ride very stiff and choppy (You would probably like it)

I now have reverse eye, 4-1/2" Mustangs Plus leaf springs on the car.  Even with the torque of the 427, the wheels never hop.

I do not recommend these Shelby underride traction bars unless you can make them longer so the center to center length is the same as the axle centerline to front spring eye bolt centerline distance on your car.  The extra length would require a stiffer piece of tubing so it does not flex with the added length.

Bottom line...  Get some good springs and you will be alot happier.

Last edited by MustangSteve (10/07/2014 9:56 AM)

That $172 is right about equal with the price of some new springs that eliminate the need for traction bars, plus they carry the load better and ride better.. And they don't look like "greasy kid stuff".

Sal, I think MS just called my baby ugly.        Check these out...they're supposed to solve the ride issue.  They look like a lot of work to me, but you may have the time.

http://www.hotrodsandhemis.com/Traction.html


 

Don't want to hijack but did'nt shelby use overide traction bars on the GT350's?