If you want your 722 transmission as clean as new

add a full can to the transmission
drive 100-150 miles

loosen and remove the bolt of the metalic oil pipe going to radiator (rdriver side just above the front corner of the oil pan)
empty much oil as possible by blowing air in to all the little holes you find from below
not to much pressure !




change filter, gasket, put pipe back, done

nice clean and as new





TESTED, no damage, working !
tho I wouldn't have that in my trans permanently