Just had similar issue with by GT242. Belt looked good but I replaced it anyway with one from John Deere store. Side by side new belt was actually slightly longer than old and I was not very hopeful. But new one cured problem. New belt was thicker, more girth than old which was worn kind of thin. Almost gives me whiplash when i pop clutch in all gears. Maybe you should consider this. Cost of belt was about $28. Good Luck PS If you go this route make sure belt is securely on all pulleys as when I started mine up it had fallen off front one and almost ruined new belt. Also, owner's manual gives no advice on replacing pulley. I had to remove some of guides and take loose the steering rod to change belt out. Also had wife push in clutch to remove old belt and put on new one. good luck