I could be wrong but it sounds like you broke a CV. Check under the boot for broken pieces/parts.crawler said:today i was out wheelin with a blown cv boot which wasnt a good idea and im not sure if that was even the reason for what happened but somthing sure broke. i pulled up to a pretty steep hill in 4 low and as soon as i was giving it gas going up the hill i heard a pop and then every few seconds a clunk. It only happens in 4 wheel drive so it must have to do with the front diff or the half axle or somthing. anybody have a guess at what happened.