Was the coupler at the end of driveshaft properly pinned to the input shaft of the transmission? It looks like there's some galling and the coupler was just free spinning on the input shaft.
And the bolt used to pin the coupler to driveshaft is not recommended. Spirol pins are recommended for the coupler to driveshaft and input shaft.
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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