Symptoms:
- Burnt clutches
- Delayed engagement
- Erratic line pressure
- Low line rise
- Low Reverse boost
- No Reverse
- Poor shift quality
- Reverse slip
- Soft shifts
Cause:
OE boost sleeve and pressure regulator bore deterioration allows pressure loss that leads to drivability concerns.Correction:
Recover hydraulic control and renew shift performance by reconditioning the bore and installing Sonnax oversized pressure regulator and boost valve kit.U341E, U341F
Oversized Pressure Regulator & Boost Valve Kit
Part No. 37740-03K
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Tooling:
- F-37740-TL3
- VB-FIX
You need this if... View Instructions Find a Distributor
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 caused by wear in the OE pressure regulator valve bore and/or boost sleeve, which allows pressure escape that causes drivability concerns. Reconditioning the bore and installing Sonnax oversized pressure regulator and boost valve kit 37740-03K eliminates pressure loss and revives line rise and shift quality in all ranges.
- Lengthened critical spools provide added stability and wear prevention
- Annular grooves help center valves in bore to reduce side-load wear
- Hardcoat anodized aluminum valves combat premature wear
- Shims allow adjustable OE base line pressure to be matched
- Pressure Regulator Valve
- Boost Valve
- Boost Sleeve
- Shims (2)
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Toyota/Lexus U341E/F Valve Body Layout
