4L80E 4L85E Boost Valve Kit Sonnax Number 34200-01K O-Ring Style.
- Uncontrollable line rise
- High line pressure
- Broken parts
- Broken clutch piston
Worn boost valve sleeve allows reverse oil leakage and worn end plug causes imbalance of the pressure regulator valve.
Ensure proper regulator valve control with this drop-in O-ringed balance oil plug and boost valve sleeve kit.