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Poly/delrin is no good in the rear control arm because its motion is not uniaxial. poly/delrin doesnt 'twist,' so you're only supposed to use it in arms that move in one direction. The rear control arm twists due to the camber curve, and a spherical bearing allows it to articulate freely.
poly/delrin is fine in the front control arm since the front/rear mounts are on the same axis, so theres no twisting motion.
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