I recently purchased a set of high end adjustable billet coilover shock absorbers for my '74. The front end of my car is very tight, the previous owner having installed polyurethane A-Arm bushings and Zerk fittings. The rear bushings appear to be OEM and are in terrible shape. I'd like to install the shocks and re-hab the rear at the same time. My question: Polyurethane or the updated neoprene (sleeved both sides with neoprene sandwich)? Either way, I know it's a labor-intensive job. The anti-poly camp says the ride is much harsher, all shocks are transmitted directly to the frame, and there is a higher propensity for paint cracking; they also point to the squeaking (Zerk fittings or not). The "updated OEM" bushings are 3X the cost of the polyurethane, but claim to offer a tight, yet more compliant ride. The car is basically used as a weekend cruiser now, but I plan to do 2-3 track events per year.
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