Ok, so we got a pretty decent amount of snow tonight/this morning. I got off work and wanted to check out the 4wd in it. Very nice. I've never driven in 4wd before and it was cool. But enough of that, I switched it back to 2wd and drove home. There is a stop sign on a hill and when I started to drive again the tires spun a bit, mr. squiggly light came on and I hear/feel a rattle. Weird. So I tried spinning the tires a bit at the next stop sign and sure enough, there it is again. So I drove around for a bit and noticed I get it whenever there is wheel spin. I turned off traction control and it lessened the noise/vibration/rattle quite a bit. Do I need to take my truck in or is this normal for the traction control?