Harsh and/or Delayed 3-4 Upshift

HARSH AND/OR DELAYED 3-4 UPSHIFT
1. Improper fluid level.
2. Damaged or improperly adjusted linkage.
3. Throttle return spring disconnected.
4. Valve body bolts improperly torqued.
5. Valve body dirty or valves sticking.
6. Incorrect engine performance.
7. Cut or worn 3-4 accumulator piston seals.
8. Clogged 3-4 accumulator piston drain passage.