Harsh 3-2 Downshift

4T60
1. Improper vacuum signal or defective modulator.
2. Sticking 1-2 servo control valve.
3. No. 12 check ball missing.
4. Sticking 3-2 control valve.
5. No. 4 check ball missing.
6. Sticking 3-2 coast valve.
7. No. 2 check ball missing or improperly positioned.

4T60-E
1. Control valve assembly No. 9 check ball missing.
2. 2-3 accumulator seal cut or damaged.
3. 2-3 accumulator valve stuck.