PST or Bergman LCA bushings and pivots?

So you’re looking at a couple of differences between the polyurethane and Delrin LCA bushings.

The poly bushing material is a little softer. But it must be lubricated, otherwise it will squeak and degrade. Keep it lubed and it will last forever. The poly bushings will also install into the old LCA bushing shells. That can be good, it saves you from removing the old outer shells. But, the bushings must be a tight slip fit into the outer shells. If they aren’t, well, you need new outer shells and the advantage is lost. For poly I also recommend using greaseable pivot pins, so you can add grease without pulling the suspension apart.

The Delrin bushings from Bergman Autocraft are harder than poly, so even less deflection for more accurate suspension inputs. But less cushion than even the poly bushings. They’re self lubricating, so, other than the initial lube to install them they shouldn’t need service again, unlike the poly. They also take the place of the original outer bushing shell. So, you have to remove the old shell but don’t have to worry about it’s tolerance with the new bushing. They don’t need to be lubricated, so in theory you could reuse your original LCA pivot pins. But because Delrin is so hard, the fit of the pivot pin into the bushing is CRITICAL. It has to be a tight slip/loose press fit. Any end play will be play in the LCA, and despite the hardness of the Delrin it will cause premature wear.

I have run both poly and Delrin on my cars on the street. I honestly like both, but the poly has to be lubricated periodically. The Delrin is a little more work on install and the fit is a bit more critical. I honestly couldn’t say there’s any more road noise with the Delrin vs the poly. In theory there should be, but with good shocks I can’t say it’s something that I really noticed when I switched from poly to Delrin.