David, The trickiest and most dangerous part is R&R ing the coil springs. By all means replace all bushings, ball joints and coil springs. Tie rods most likely will need replacing as well. If you are not set up to press bushings and ball joints, take the control arms to a local auto machine shop to have this done. Also closely inspect the control arms for cracks. I don't believe the lowered spindles will cause you to have to change your brakes. You will not believe the difference the changes will make in the ride and handling of your car. Others may advise you differently, but I don't recommend polygraphite bushings. Yes they will offer less deflection but on a street driven car I would stay with stock rubber bushings. I have used both and in my experience the  poly bushings will become noisy in time. 
Mike Holleman
----- Original Message -----
Sent: Tuesday, August 23, 2005 12:13 PM
Subject: [Chevelle-list] 1970 chevelle

what all should i replace when rebuilding the suspension front and back. as of right every thing is original and worn out.i have found some good suppliers of parts suchas pst yet im not sure what to buy. I was told that there is a guy. that sales rebuilt control arms does anyone know how to find them. iwant to buy a kit yet do not want to try to replace the ball joints my self as ive been told it can be tricky.i also want to put drop spindles,but does that mean ihave to replace the brake calipers? what about the springs? where do we start.    thanks ,david


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