No Upshift

1. Low hydraulic pressure.
2. Defective or leaking valve body.
3. Low fluid level.
4. Incorrect gearshift linkage adjustment.
5. Incorrect throttle linkage adjustment.
6. Worn or damaged governor support seal rings.
7. Worn or damaged reaction shaft support seal rings.
8. Faulty governor.
9. Kickdown servo band or linkage malfunction.
10. Worn or faulty front clutch.
11. Engine performance.