I was driving home Friday after we had a couple of inches of snow in the left lane going about 45MPH, mostly wet road with some slush on the left side. At about 45 I got that 4WD humping, if I went faster or slower I couldn't feel it. Truck has 16K miles on it and has been perfect till now. Never felt the same thing in my 04 2500 gasser. All of the tires have 45PSI in them. No noise just the humping. Anybody else get this? I'll check it again, it looks we are getting more snow Friday. Thanks for the help.

i had a problem also that i am going to post similar to what your saying in a way...