[Jon Yaffe]

Seth,
I sold suspension kits for newer chevys for a long time and I know the alignment issues pretty well. If there are offset washers attached to the upper control arm mounting bolts (at the frame mount of course), then cam-bolts have already been installed. The bolts have a D shaped cross section and the washers are shaped like an oval. Installing these cam-bolts is generally required when re-aligning the truck, and since it has 175K miles, I would assume it's been aligned before! Good luck, maybe try another shop (I've had good luck with sears and they're cheap, or try Fourwheel parts performance centers).