I have solid uppers and spherical diff bushings. I cant say that I feel any torque box bind. I also have a full 2in drop. I have had to replace the bushings before, but it was only $15. I also had double adjustable uppers with spherical bushing at both ends. not sure if the were adjusted properly but I could feel the bind with those and the ride was entirely too aggresive for my taste. throttle response was awesome though..definitely tight
are these the ones u guys are talking about?? http://maximummotorsports.com/
HD Rear Lower Control Arms, 1979-98, with perch, swaybar
this is the first one
they have a couple different ones????with perch without???