Engine Overspeed During 3-4 Shift

1. Time control valve and 4-3 downshift valves not coordinated.
2. 1-2-3 clutch damaged.
3. Damper function of 1-2-3 clutch and 4-3 traction valve not functioning properly.
4. Orifice control valve sticking.
5. 3-4 traction valve binding.
6. 2-4 band slips.