I have a 2013 GMC AWD Terrain. A few months ago the transfer case went bad. I had purchased from CarMax with the extended warranty so they had the dealer replace the transfer case and when I got the car back there was a very apparent noise coming from the bottom of the car. Sometimes it sounds like the rear wheels, sometimes the front. Or maybe a suspension noise. CarMax had it in their shop for a week and could not diagnose, made me pay for new rear shocks. Got the car back and the noise is louder and more evident every time I drive it. Took it back to dealer and they have had for 8 days and are completely unable to diagnose the issue. What the heck is going on?