- Burnt clutches
- Delayed engagement
- Erratic line pressure
- Low line rise
- Low Reverse boost
- No Reverse
- Poor shift quality
- Reverse slip
OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.
Recover hydraulic control and renew shift performance by installing Sonnax boost valve kit.
Boost Valve Kit
- Boost Valve
- Boost Sleeve
- Shims (2)
Toyota/Lexus vehicles equipped with U341E and U341F transmissions may exhibit insufficient line rise, resulting in delayed engagement, slipping in Reverse, poor shift quality and burnt clutches. These troubles can often be traced to wear in the OE boost sleeve, which allows pressure escape that causes driveability concerns. Installing Sonnax boost valve kit 37740-01K eliminates pressure loss and revives line rise and shift quality in all ranges.
- Sleeve manufactured from highly wear-resistant aluminum
- Hardcoat anodized aluminum valve combats premature wear
- Annular groove helps center valve in sleeve to reduce side-load wear
- Shims allow adjustable OE base line pressure to be matched