I was riding at Shiloh Ridge this past weekend and I noticed that my front diff make a loud pinging noise when I am in 4x4 low range and under a load like going up a steep hill or carring a heavy load. the heavier the load or the steeper the hill the louder it gets it sounds almost like it does when your exhaust pipe is warming up and it makes the tinking sound until it is fully warmed but its louder and more consistant . It also does it in high range but not as bad because it does all the time in low range. I only have about 155 mile on my 700 . Does anyone have any idea?