I recently bougt a 2003 sportsman 700. recently i noticed that in high, all the wheels were spinning when the switch was on 2wd. Ive been reading an they say the rollercage can be the problem. the thing is that in reverse i go into 2wd and in low it sometimes goes in 2wd, but in high, its always in 4wd. front diff has fresh fluid with correct amount. any ideas??