2005 360 Prairie locks up when the bike is turned off and put neutral. Will roll forward not backward. Does anyone have the same problem? What should I look for? It also feel very tight in the rear.

 

Don't drive like that anymore!!!
It sounds like the big nut that's holding the rear pinion shaft bearing came loose in the rear gear case and it's intermittently locking up the drivetrain. If you continue to ride like that, it will cause a puncture in the gearcase and/or swingarm costing you lots of $$.

You neend to disassemble the rear gear case and tighten up the nut (really big) and use loctite.

Get a manual if you will do this job by yourself and don't understand this.