Check the steering for excessive play. The interior will rattle, creek, and make any other weird noise that you will never find the source of. There is a problem with rock chips on the rockers and doors. The "Service Stabilitrac" message will pop up from time to time. Transmissions and T-cases have already been mentioned. Front hubs are shit (I've already had 1 replaced and the other is starting to hum). Upgrading the rear swaybar makes a world of difference. Bone stock, the engine doesn't start to wake up until 4-5K rpm.