I have an 05 Isuzu Ascender with 200,000+ miles on it that I recently bought used. I have a lot of noise in the front end while at all speeds. I wanted to test the 4HI setting the other night while in the drive thru and I engaged it and attempted to turn out of the lane and the entire truck came to a stop. I heard a loud clunk. I immediately backed a little and disengaged the 4WD. Nothing has flown out during regular driving. My question is, could this be a CV axle issue? They do not make the familiar clicking when cornering like a bad CV would.