| type of bushings utilized. Rubber vs poly vs metal spherical are as different as night and day when impact harshness due to stiffer springs and shocks began come into play. I went full poly with stock springs and shocks before I realized that was not the direction I wanted to go in suspension upgrades. The first sign came after I installed the SZ aluminum inserts to tighten up the rear crossmember. Each aftermarket component further added to the impact harshness. Finally, I sequentially removed everything one by one. The spherical bearings in the tension rods were the worst offenders, followed by the FUCAs.
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