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Over time and under constant pressure a poly bushing CAN cold flow, but it isnt something that you are going to notice in a few years.
I pulled the poly leaf pads out of the 73 a few weeks ago and they had cold flowed enough that they wouldnt go back in nice when I pulled the slapper bars off, I had to put the new ones in that I got with the "U" bolts for the rear.
Josh is completely correct though, for the money a stock rubber bushing isnt worth the time or effort when you can get new, stronger, longer lasting arms inexpensively. If someone is only daily driving a vehicle and doesnt care about performance at all that driver is NEVER going to notice the minimal amount of bind created by the stiffer poly bushing.
Hell I bought all the stuff and put my own LCA's together for around $125. They are on car adjustable and are infinately rebuildable, no brainer
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