X360 Rear Rubbing noise

My mower has recently developed a rubbing noise in the rear but i can't tell what it is. The blades on or off doesn't matter. The fluid level is fine. Doesn't happen in reverse but that may be for a different reason. Happens going forward, right off the bat, doesn't need to be warm/hot, sounds like something rubbing. Under load seems worse, happens whether going fast or slow. The rubbing sounds is faster when going faster and slower when going slower. Any thoughts?