2010 500 Ho Barely rolls

I have a 2010 Sportsman 500 HO that when you put it in gear acts as if the brakes are still applied. When you shift to N , the machine feels like it is still in gear but you can barely roll it. I did raise the rear end off the ground, and when you give it some gas, right as the wheels start to turn it sounds like metal slapping but I couldn’t pin point it. I have removed the rear brakes, tires and the wheel hub. The CV shaft is hard to turn as well. Any thoughts?

Thanks, Brad