Nope, you're pretty much right on top of it there. A good deal on this around the turn of the century when early adopters installed LCA/UCA as sets with those neat urethane bushings to stiffen up things, and the tops were getting chewed up by the connection point. It generated a lot of forum chatter on too stiff of bushings causing torsional binding of suspension from its full travel arc. The fix ends up losing the urethanes and using either just flexible rubber again (but new at least and not all sponged out), or a swivel bearing with a ball (heim joint is an example). Have not searched but johnny jt. may be aimilar.
I've had extended Metcos with urethanes since '99, and yes they're chewed a bit at the brackets. If I raced then they'd get changed to low maint. rubber. Under 'mildly curious' I always wondered that since most all extendeds are adjustable uppers, why not just leave the jamb nut lose and let the axle bracket rotate free on the threaded mount stud. There'd be zero torsional resistance that way. EDIT: I imagine without constant lube the threads would gall until the stud snacpped = not good.
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
Last edited by 96 Black; 01-16-2019 at 06:56 AM.
Reason: Just thinking