Harsh and/or Delayed 3-4 Upshift

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