Printpartsummary
Symptoms:
  • Burnt clutches
  • Delayed engagement
  • Erratic line pressure
  • Low line rise
  • Low Reverse boost
  • No Reverse
  • Poor shift quality
  • Reverse slip
Cause:

OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.

Correction:

Recover hydraulic control and renew shift performance by installing Sonnax boost valve kit.

U341E, U341F

Boost Valve Kit

Part No.

37740-01K

Boost Valve Kit
  • 37740-01k_combo

  • Boost Valve Kit

  • 37740-01k_measure

Small_37740-01k_combo Small_37740-01k Small_37740-01k_measure

U341E, U341F

Boost Valve Kit

Part No. 37740-01K

  • Boost Valve
  • Boost Sleeve
  • Shims (2)

Complaint:

  • Burnt clutches
  • Delayed engagement
  • Erratic line pressure
  • Low line rise
  • Low Reverse boost
  • No Reverse
  • Poor shift quality
  • Reverse slip

Cause:

OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.


Correction:

Recover hydraulic control and renew shift performance by installing Sonnax boost valve kit.

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

Related Parts

You need this if...

OE boost sleeve wear is visually detected.

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Valve Body Layouts

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.

Valve Body Layout Toyota U341E/F
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