I just finished drilling out my old Chevy bushings and replaced them with Urethane's. I should have the springs on by next week to see how they do with the new bushings installed. The urethanes that I purchased needed to have the original metal shell that the old bushings sit in removed. Was a bit of a pain, but a hack saw can slide in between the spring eye (18 tooth recommended- I don't have fancy tools ). After cutting through the shell, simply pound it out and stick the new ones in.. I think they are Energy Suspension Urethane's....
I'm in the middle of doing my Chevy swap also. My springs had one of the bushings missing so I had a new one put in. The sleeve from the old one was still there and I didn't feel like messing with it so I brought it to the spring shop and they just torched it out.
For stock bushing, torching out the old sleeve and inserting the new bushing it was only $9.
I checked with Chevy too, their price was like $16 a bushing!
from my experience, polyurathane bushings are a lot stiffer therefore reducing flex. However, they last bout 10 times longer than the stock rubber ones. Just need to figgure what is more important, flex or longevity.
Iwould choose the rubber ones, they're cheap enough to replace and i want as much flex as poss.
Just my two pennies
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