Harsh Downshifts During Deceleration

1. Improperly adjusted manual linkage.
2. Defective vacuum diaphragm or piping.
3. Defective kickdown solenoid, switch, or wiring.
4. Incorrect line pressure.
5. Defective manual valve.
6. Defective governor.
7. Leaking oil passages.
8. Defective accumulator.