Hello all, I'm new to the forum. I have a 2005 rhino 660 with 570 miles and 3400 hours on it. I have been reading about everyone's similar issues, but mine seems to be different. When riding in high on blacktop road, down hill it will rev limiter but up hill speed drops from 40 mph to 15 or 16 mph. Belt moves up and down pully as it should and also measures within specs. I havent noticed burning rubber smell either. The other day I hooked up to a tree, in low rear tires spin, in low 4 wheel drive with axle lock on, all 4 tires spin. In high gear tire dont spin at all, the engine just bogs down. Does anyone out there have an idea on where to start??