If 449 hours is new, that's good news for me. I have a 2084 Super Garden Tractor with just 500 hours on it. A conversation with the local dealer yesterday indicated that at 500 hours it's time to change the fluid in the transmission. My tractor sometimes is sluggish in reverse (they are meant to creep slowly, not zoom backwards!)
I ordered a new filter (the hydraulic oil filters are NOT the same as similar sized automobile engine oil filters) and I hope that new oil makes it run better. I've been told that new transmission oil will improve the performance.