Front end rise

[Alan Nyhus]

Originally Posted by SSDiv6

In Polyurethane bushings, the sleeve, instead of remaining static in the bushing, also tries to turn inside the bushing when pivoting. Polyurethane does not have the low friction and the load bearing characteristics of Teflon or Nylon thermoplastics, therefore, while pivoting, it will flex under load.

There are definite differences in polyurethane control arm bushings from brand to brand. Some polyurethane compounds are 'sticky', for lack of a better term. A lube like Permatex Super Lube between the bushing and the sleeve makes a big difference.

[Eman]

Polyurethane will also dry out and crack over time. Have a Fox body with adjustable rear control arms with poly bushings. The bushings dried out and cracked into pieces and fell out.