Harsh and/or Delayed 3-4 Upshift

HARSH AND/OR DELAYED 3-4 UPSHIFT
1. Incorrectly 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. Incorrect engine performance.
6. Cut or worn 3-4 accumulator piston seals.
7. Clogged 3-4 accumulator piston drain passage.