Some of the issues with these lifts are greater CV wear caused by the increase in CV angles, the stock upper a-arms use pressed in ball joints that can work their way loose under heavy loads, these lifts do nothing to control the added leverage the larger tires put on the sterring components, Chevies are notorious for weak idle/pitman arms, I have seen them wear out and take the wheel bearings out in as little as 15,000 miles, and finally the longer spindles actually offset the front wheels outward about an inch, increasing the front wheel track width, basically the front wheels stick out farther than the back wheels.
Chris
All this happened to me. Fortunately, my wheel bearings lasted til 37,000 miles, just long enough for Chevy to give me grief about being out of warranty.