Quote: Urethane would probably weigh a little less, but not much. It depends on the size and function of the bushing. Since some of us may be watching ounces now, then any little bit would help.
RMCHR, I differ on the arms. I weighed my stock UCA's with bushings and all a ways back compared to the Magnum Tubular arms with bushings and all, and the Tubes were lighter. My stock pair of arms weighed 10-1/2 lbs and the Tubes weighed 8-1/4 as a pair. Saved 2-1/4 Lbs total. This might be that the Tubes have Urethane. My lower factory stock control arms have the stock rubber bushings though. I just had made a couple of small items that saved a few ounces. I'm now at 126 ounces into 1600.
Wow, I'm surprised, that's a lot of weight off in the upper a arms. I was under the impression that the stamped part would be lighter than pieces of tubing welded together. Guess it would also depend on what material the tubular a arms are made of and if there is any extra gusseting and welding.
Though I never weighed them, the UCAs on my Dustpan are pretty light, like next to nothing. I handled them a lot when I re-did 'em, I was surprised how light they were. I did consider getting aftermarket ones for a while but didn't think it would provide much benefit for what they cost.
Perhaps there is a difference with A body vs. B body or small ball joint vs. large.
