The process does take a while just be some what patient is all can say. GM did a buy back on my 2014 Sierra Denali 4WD 6.2 and ordered me a new 2015 Sierra Denali 4WD 6.2 it took six weeks just build my new truck and get it delivered to the dealer. I haven't even got to drive it to check it out really good but there was no vibration so fare with the Magna ride. I'm in the military so the day after I picked it up on 17 Apr 2015 I deployed to ntc in California for a training excise so when I get back and get to drive it I will update further on the new truck. But besides that the buy went well they did it kinda like a trade in and paid old my truck off completely so I was only out the ten months of payment that I had maid on my old truck. So since I'm in the military I got the gm military discounts on the new truck and few other discounts and now I ending up paying less for the new truck with all up grades for about a $1,000 less than I paided for my old truck in my original loan.