Hi Eric ! I bought a used 2001 D/A K3500 4x4. One of my first days, not used to the feel of shift lever and a bright sunny day, I accidently took off in 3rd gear ! Thinking it sounded different (winding up) I heard a strange high pitched rattling noise and backed off throttle. It to me sounded like bearing noise from transfer case, Then noticed i was doing about 55 in 3rd and tach in redline! Did I do any damage ? Would something make noises of complaint in this condition or is this not normal and I should have it checked out! I know this is difficult to answer! The dealer put in a rebuilt transfer case when I purchased so I suspect this one is faulty also! Thanks, Dan