Same thing happened to me when I had the 7" gorilla lift and 29.5" swamplites. I did it on the snow doing doughnuts and broke through to dry pavement. It ended up being the same thing GREGC is talking about. It cracked it in several places and stripped out the driveshaft. Driveshaft was under $50 and the coupler was something like $15 I think. not too complicated just a PITA! You notice I'm running 26" tires now
2004 rhino 660
custom intake , ported and polished head, raptor valve springs,mud buster cam,dynojet kit, UTV powersports machined sheave, UTV crap Purple secondary, 12g rollers. Dragonfire CDI box, Moto works exhaust, Modified head pipe, Fully snorkeled, 26" outlaw MST's, black ITP ss108's, yamaha top,sony cd player, 6 speaker sound bar, J-srtong half doors. 2 Hella 500 aux lights. Pro-Armor front bumper.