>Let me not be misunderstood. I'm not concerned with axle tramp (I
>mentioned I'd seen an interesting setup on Wally Swift's Alpine which
>involves use of horizontally mounted shocks subframe to axle - not sure
>what it does, but if you've seen Wally at an auto-x.....). My concern
>is with rear spring squirm. Although running Tiger leafs (stiffer), I'm
>looking for an elegant and simple method to prevent lateral movement of
>the rear wheels in turns (as in road race application). Panhard rod is
>a compromise because it allows the rear wheels to move in an arc with up
>and down movement of the body and a Watts linkage appears to allow no
>wheel arcing, but looks heavy, complicated and expensive. The A-arm
>(v-shaped assy mounted by brackets on the subframe to a single bracket
>on the differential housing) looks intriguing because it appears to
>arrest side-to-side axle movement, allow the wheels to move up and down
>only and, as a side benefit, resist tramp. Thoughts, analysis.....?
Ahhh, so you are looking to locate the rear laterally, and not so concerened with axle anti-twist devices.
If you have high rate springs on the rear, the amount of supsension travel "under normal circumstances" will be reduced proportionally to the increase in spring rate. If the end result is to make an auto-X car, or a road racer, the rear suspension will be tight enough that the panhard rod will be quite acceptable. Since there is less bump travel, the spring deflection due to the arc, is small, and wont effect handling enough to speak of.
Have you considered de-arching the springs and using hard bushings?
Jarrid Gross