Rear shackle bushings Rubber or Polyurethane ??

[HotRod20]

Opinions requested please,: using S/S springs, what is the census for shackle bushings, rubber ? or polyurethane ? and why you have a preference. Trying to decide what to install and would like opinions of those who made a choice for either one. This is going to be mostly a bracket racer, with occasional street time. Thanks to everyone who comments,
HotRod20

 

[BergmanAutoCraft]

Urethane is a better choice provided they are lubed properly. The rubber ones are super soft and don’t hold the correct shape against the shackle.

 

[CUDA69]

Polyurethane, still good after 44,000 miles and 20 years of hard use (autocross, 1/4 mile and road courses).

 

[Locomotion]

With only occasional street use, consider poly or even aluminum spring eye bushings for the front as well. Soft rubber is wasted motion & energy and most locations benefit from the firmness. Transmission mounts, however, should not be solid/aluminum, but good with poly also.

 

[72bluNblu]

If you can weld you might also consider a set of spring sliders. They can be used in the stock location with a pretty easy to fabricate bracket.

 

[HotRod20]

Wow, very cool,.. nice work. Installed Poly bushings ..thanks