the noise sounds as if the belt slips every now and then the mule surges, loud clunking / popping sound, connects immediately then normal until it pops again. pops every 5-10 seconds while normal riding, not towing, no hard climb just normal driving. I've ordered a service manual download. doesn't really talk about it. I'm obviously going to try the belt but I think it's more than that. definitely feels like it's in the clutch system for sure. I've read here and there about normal popping sound this is loud and obnoxious and is certainly not normal sounds like it's going to break major bad any time.