I have an 05 rhino and everything is quiet in two wheel drive but when I put it in 4 x 4 it makes a grinding noise up front. Has only 75 hours and 700 miles. I have changed the front diff. oil (the old stuff looked brand new). Changed the rear diff. oil,engine oil,and antifreeze. Took all the skid plates off and everthing looks great,no dammage. Just picked this unit up and own two 660 grizzlies and have never heard this sound on either of them. Have heard about a torque limiter on another forum, but can't find any more info on this.......any suggestions would be greatly appriciated........mark