I have a 2004 Foreman 450S and the other day I was coming up the driveway in first gear and hit the throttle hard. I heard a crunch noise and it wouldn’t move. Sounded like jumping out of gear. I pulled the rear end out and all looked good with it so I cleaned it up and put it back together. The drive shaft looked ok too. I started it up and when you shift gears while in 2wd it does nothing, no noise, just the rpm comes up like its in neutral. If I put it in neutral you can’t hardly push it because the back wheels will drag. If you put it is 4wd it will go but with a strain because it is still dragging the back wheels. When I put the rear end back together it seemed to turn easily. I work on atv’s as a hobby but I haven’t ran into this problem before. Looking for some input.