Also i have taken apart many old front suspensions and found some of the original rubber bushings cracked but still doing their job after maybe 40 or 50 years.
While I don't doubt that it's possible, that's never been my experience personally. I've actually had the LCA's fall off the pins on a couple of my cars because the LCA bushings were just totally gone. I mean, I only have a handful of mopars. And I've only pulled suspension parts off a handful more at the local wrecking yards, plus some more I didn't mess with because they were C-bodies or I already had enough parts. So probably a bit less than a couple dozen cars all totaled up. But so far I've yet to find a car where the LCA bushings were in good enough shape to run without replacing, and that's on cars with as little as 80k original miles. They've ranged from worn out to almost completely missing. My EL5 GT, with only 81k original miles, had wiped out one of the bushings so badly that the pin was riding on the inner shell of the bushing. When I took that one apart the LCA just fell off the pin when I pulled the torsion bar. But I don't know the histories of any of those cars really, and you can ruin a set of brand new rubber bushings pretty easily just by tightening the suspension parts incorrectly.
When I pulled the poly bushings on my Duster last week to replace them with my new tubular LCA's and Delrin bushings the poly LCA bushings looked brand new with 12k miles on them, like I'd installed them yesterday. But I know they can be ruined by improper installation too (like anything), it just takes a little more work.
