Cannot down shift past 3rd gear into to 2nd, 1st or neutral. when we opened up the right side the clutch push rod came out in two pieces. the last inch of the rod was broken off cleanly at the joint were that piece is joined to the rest of the push rod. Have not split the case. clutch, Peering in with a flashlight, gear box and gears all appear in good shape. can see no obvious damage. any ideas. What is our next step?