The 400 & 450 foreman's are not to bad on them. The 500's are the one's having the problems. From what I have read the new u-joints are not as strong as the old one's, I have not had a chance to compair the two, so I can't realy say. I am still running my original 98 foreman 400 u-joint in my 450 with no problems what so ever.