they are correct about the bushings... chevy for some reason switched over in the new trucks and started surronding the pitman and idler arm stubs with nylon (I think) bushings. This creates a huge weak link and they will and do wear out prematurly even in stock trucks. Many lift kits on the market use a upper control arm drop and a very narrow steering drop with tie rod extensions. THis has become normal but unfortunatly is very very harsh on componets The leverage created by larger tires on a narrowly spaced upper/lower control arm is increased many times over stock. This typically causes lifted trucks to knock out of alignment easily and also wears pitman /idler arms. Couple that with the weak parts to start with and you get your problem.
So long story short cognito offers a pitman/idler arm support kit that reinforces both pieaces and virtually elimnates wear on these parts.
I'm a dealer for them if you need anything. It's a very simple kit to install