Runaway Upshifts

1. Low hydraulic pressure.
2. Defective or leaking valve body.
3. Low fluid level.
4. Clogged transmission oil filter.
5. Aerated fluid.
6. Incorrect throttle linkage adjustment.
7. Worn or damaged reaction shaft support seal rings.
8. Kickdown servo band or linkage malfunction.
9. Worn or faulty front clutch.