- High line pressure in Reverse
- Low line rise in Drive
- Soft shifts
These problems can be caused by severe wear of the boost valve sleeve, allowing EPC and reverse oil leakage.
The Sonnax boost valve assembly has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.
Boost Valve Kit
Toyota vehicles with a U151E/F, U250E transmission may exhibit insufficient line rise in the drive ranges and excessively high pressures in reverse. This may be caused by continuous oscillation of the steel boost valve within the cast-aluminum sleeve, creating excessive wear and a path for EPC and reverse pressures to leak. The Sonnax replacement boost valve assembly, 27741-01K, has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.
- Boost sleeve manufactured from highly wear-resistant billet aluminum to prevent the excessive wear exhibited by the cast OE sleeve.
- Salvages expensive valve bodies.
- Restores proper line rise.