Never happened before. I have owned it since new. The roads were snow covered and slippery, that is what 4 HI is for. I have driven it in these conditions many time. It is definitely not "normal" binding. It is very loud.
2011 2500HD Duramax.
Engaged my 4WD High on a snow covered road the other day. Every mile or so I would hear a loud clunk. It sounded like the front and rear driveshafts were not spinning at the same rate and popping to line up again. It happened at any speed. I haven't changed tires and the air pressures are the same on all 4 tires. The truck only has 70k miles. I am frustrated with this truck. Bought it new and always have problems.
Thanks for your input.