Originally Posted by Nuck Chorris
would stiffening the rear bushings reduce deflection in turns? I've got rubber now, would moving to aluminum or poly be a good idea?
The beauty of rubber bushings in a leaf spring set-up is that they do distort and deflect. When you go over a one wheel bump or when you are cornering and have body roll, the rubber bushings allow the rear suspension to twist slightly and not bind. If you replace the rubber bushings with polyurethane or aluminum or delrin or any other stiff material you have compromised the ability of the axle to "twist" in one wheel bumps. Stiff bushings are not a problem when both wheels hit a bump at the same time (speed bump for example) or if the car is used mainly for drag racing, but for the street, keep good rubber bushings in there.
If you want to get rid of that flexing feeling while cornering, but still want compliance in the rear suspension, then install a panhard bar as I described in an earlier posting. It will help also if your tires rub while cornering.