If it wasn't for you saying that the lift works, I was going to say it sounds like one of the roll pins for the driveshaft is sheered. Maybe it's possible there's still a sheered pin but the pump is spinning just enough to give you lift but not forward/reverse motion? hope you figure it out. I just brought home an IH built 782 that needs some serious TLC hope to get it looking as good as that one.
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Adrian
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