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


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.

U151E, U151F, U250E

Oversized Pressure Regulator & Boost Valve Kit
Part No. 27741-08K

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 U151E/F, U250E Valve Body Layout

Toyota u151ef  u250e

January 21, 2013

Toyota U151E/F, U250E Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission Toyota/Lexus U250E Transmission U151F Transmission U151E Transmission

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  • 27741 08k combo
  • 27741 08k

You need this if...

Either a Wet Air Test or a Vacuum Test in the location shown, result in leakage. Vacuum test must hold a minimum of 18.

  • 27741 08k test2
  • 27741 08k test