I did a complete rebuild of my 1977 T/A's front and rear suspension with the polygraphite kits from PST. Compared to old, cracked, worn stock rubber pieces, there's a big difference in ride and handling. Is it harsh? Not to me. Is it firm? Yes. It feels like a sports car. It doesn't beat you up in daily driving, but you sure notice it when you push into a corner harder than normal. Freeway on/off ramps are alot more fun now. Would I do it again? Absolutely. PST mis-shipped one part (rear sway bar bushings), and after I called them I had the correct part in a couple of days. No biggie. In my experience, the quality was good. I've only got a few thousand miles on my rebuild, but I'd use them again.
Just my $0.02...
Mike
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Mike
1977 Trans Am Y82
'69 428, stock '69 #16's, 041 RAIV/Rhoads, 3.42s, Cliff Q-Jet, Continental Tight-10/TH350, RA Manifolds (oversized, ported) with Pypes x-pipe system and Street Pro's, Edelbrock Classic IAS shocks, PST polygraphite suspension, custom subframe connectors.
Still waiting on my Tri-Y headers (since June 2005). 
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