You should not have any play in the CV joint adapter where it fits on the input shaft to the transmission. My bet is that it and the shaft are worn. You'll probably need a new adapter (item circled in red), they are NLA from Cub but fortunately Jeff in PA makes an improved replacement that has 2 set screws to help eliminate the wobble if your input shaft is also worn.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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