I installed the rear discos this past weekend on my 4th gen. I will be honest and say that for me, it took some time to get them what I'd consider just right. That being, they don't make any noise, still disconnect AND re-connect fairly easy, and don't come into contact with the LCA when they are connected and the 4runner is flexed. The sway bar moving around while disconnected does make some noise but that is to be expected. I may come up with something to put over the ends of the sway bar to help keep it quiet. I'm not running a long-travel suspension (not yet anyway) so improvement on flex was minimal, which was also expected.
As for the front discos, first run was a no-go but [MENTION=98153]MStudt[/MENTION] has been helpful in giving advice to some of my issues. Turns out my 4th gens sway bar is a lot closer to the passenger side steering knuckle (aka spindle) than most. I feel this is due to my current alignment settings ( over 4* of caster), the fact that the sway bar is not relocated forward and normal manufacturing tolerance. Either way, as of now, those discos will not work for my 4th gen. I may try to re-install Friday following some advice from MStudt or I may wait and try to find a cheap sway bar relocation kit that I can buy or borrow. Who knows, maybe I'll just make one if I have time. Honestly, it may be a while before I can revisit these but I will post my findings either way.