I have just under 100K on my 2007 Sierra 2500HD 4X4 extended cab. Over the Fall we took many trips to the coast over the winding coast range roads with the camper loaded. I never had any issue with the steering; I would turn into the curves on a good line and just hold the wheel steady through the curve. So, after I unloaded the camper I felt a little pull to the right and when I let go of the wheel the truck would head for the curb. The dealer said that the steering components were worn and replaced the tie rod ends, center link , and pitman arm and pronounced it all good. But, I found that the steering wheel was not straight when driving on a straight road so I took it back thinking that they had not adjusted the tie rods correctly. Surprise, now they say that the steering box must be replaced or the steering wheel won't be straight and I won't have good steering. The cost is beginning to add up quite a bit. My question for you guys is: Do the dealer mechanics seem like they know what they are doing? I'm beginning to have my doubts.