Suspension upgrade

[SCOTI]

Originally Posted by SEVEND2

Curious on what's best, oem rubber, or the Polyurethane on a front Stock rebuild

63-72's used rubber lined threaded steel bushings that pivot for the a-arms. 73-87's used 'car style' larger rubber bushings in a shell for the a-arms.

The earlier bushings are better as they allow less deflection & pivot to allow movement vs. the later bushings relying on 'twist' of the bushing. Later bushings are prone to deterioration of the fatter rubber bushing much like the cars that use that type of bushing.

To correct the failing rubber issue, Poly was introduced. While it doesn't dry up & crack like the rubber, it does have its own issues. It can still split + crack like rubber in harsh environments & it's common for it to squeak after some time.

The remaining front end 'wearables' (Bj's, Tie Rod ends, Pitman & Idler arms) don't use poly other than some brands will use it for the grease cup seals.