REALLY HARD TO TELL ABOUT IT BEING STUCK IN ANY GEAR BUT MY BEST GUESS IS THAT THE 3-4 SHIFT FORK IS BROKEN, NOT A BIT UNCOMMON ON A HI MILAGE TRANS NOT TOO HARD TO FIX BUT IT HAS TO COME OUT AND BE TAKEN APART AND THE FORKS REMOVED , PRETTY STRAIGHT FORWARD ONCE THE CASE IS REMOVED .. JERRY