Poly Bushings issues

The complaint with poly lca bushing isn't just noise. Noise is common on all poly bushings. They do make a special grease for greasing poly suspension bushings.

The complaint with poly lca's is the fact that there is no friction/tension from the bushing acting on the lca to keep it from moving forward or backwards on the bushing. Some people have gotten clever and designed lca pins that have a positive stop on them to prevent the arm from walking, but I don't recall the specifics. With normal pins and poly bushing the torsion bar is all that locates the lca and keep it from sliding off the back of the pin.