I'll toss out a couple other possibilities 1st check and see if you have stripped splines on the axle or hub(items circled in red) 2nd you may have a problem with the 4 bolts that hold the diff together (items circled in green)
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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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