Alright I was out this last weekend riding on flat ground of all things and then all the sudden my atv didn't wanna really move. Give it gas and seemed like driveshaft was just spinning in the rear end and hitting the gears here and there. Put it in AWD and pulled my self home. Got home and started looking at it. Where the drive shaft connects to like the back of the motor there is about a 3" sleeve there that goes over the spline and gears. When the cover is over the spline and gears it works fine, but now the cover moves and when it moves thats when I am running into the problem of the ATV not moving or wanting to move. Slide the cover back down and all is fine. So my question is what holds that cover from moving. Is there a pin or clip or what. I'm dumb founded but need help ASAP.

Thanks