http://www.nastyz28.com/forum/showthread.php?t=70313

Thanks. I figured it would be a post by Brett.

To the heart of the matter, it is echoed in books like Herb Adams' Chassis Engineering. It's all about the bind, and to a much lesser degree the way it wears. WBT I bet your local library has a copy, it's a terrific book. That said, a poly with a steel insert that is greasable at the pivot point is different from a pure poly bushing.

IMO poly is a step between OE rubber and solid racecar type stuff. With the advent of solid stuff with delrin inserts for a street car you get much closer to the best of both worlds, without the inherent noise and wear issue of actual bearings that are not weathertight. For a pure street car a higher durometer solid rubber bushing is likely an excellent, perhaps cheaper, upgrade.

I own and have read that book. Very good but possibly dated in terms of technologies. The wearing/gel thing is what raised an eyebrow.

Yeah, I remember reading that when I was putting together the 72's suspension.

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

Is it worth it to replace the front lower/upper A arm bushings with Moog stuff if they are coming off anyway?

In my opinion.. No. But I like my cars to look as nice on the bottom as they do on the top.. Plus if its off already why not put something better back on?

Just current budget issues, I'll do some more research.