Right front wheel bearing assm. was locking up on icy roads!Very dangerous.Not having the best of hearing "being a mechanic for 35years" did not hear it till it landed me in the ditch Ive had vehicles turn 200,000miles with out this repair needed!.

I've had it in the shop twice now, still no resolution on where the noise is coming from. The first time they blamed it on my bedcover rails. I'll suggest to them the 4wd transfer case possibility.

grinding sound at 45-50mph, 1000-1500rpm. grinding sound is most likely coming from auto 4wd system trying to engage, but very mysterious problem