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  • Clutch & band failures
  • Low line pressure
  • High line pressure
  • Soft shifts
  • Harsh shifts
  • Low converter pressure
  • High line pressure in Reverse


Continuous oscillation of the pressure regulator valve causes valve body bore wear, which results in line pressure irregularities and valve instability. Severe wear of the boost valve sleeve allows EPC and reverse oil leakage.


This oversized pressure regulator valve and boost assembly allows the valve body bore to be restored to normal operating condition.

U140E, U140F, U240E, U241E

Oversized Pressure Regulator & Boost Valve Kit
Part No. 57917E-08K

You need this if... View Instructions
  • Oversized, hard-coat anodized valves are manufactured to extremely tight tolerances and resist wear.
  • A new spring is included to work with the oversized valve and re-establish OE regulated pressure specifications.
  • Kit includes an increased ratio boost valve assembly specially designed to work with the oversized regulator valve.
  • Pressure Regulator Valve
  • Pressure Regulator Spring
  • Boost Valve
  • Boost Sleeve
  • Boost Valve Plug

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 U140E/F, U240E, U241E Valve Body Layout

U140ef vbl thumb

December 21, 2012

Toyota U140E/F, U240E, U241E Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission Toyota/Lexus U241E Transmission U240E Transmission U140F Transmission U140E Transmission

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  • 57917e 08k combo
  • 57917e 08k

You need this if...

Excessive leakage is found at either of the two locations shown

  • 57917e 08k test