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I would drain the oil out of the transmission and see if there are any chunks/pieces in the oil.
You can take the top off the trans also and check inside it.
Ask any auto parts place where to get a hose made.
Dang, thats a rare bird - a M246A1. Make sure your PTO is disengaged and check all of the linkages also.
Also read through the TM's for the truck and try to troubleshoot your problem.