I have just recently bought a 06 brute force 650i and was out riding it this weekend and was helping to pull a friends Rasor out of a hole when the front end started to click loudlly. After we got him out my brute force drove fine when in two wheel drive. Later in the day I dropped into a hole myself myself and needed the 4 wheel drive but the clicking started again. After I got out I tried driving in 4 wheel but there was not clicking even when turning. Thought maybe u-joint or differential lock? Any ideas?