Symptoms:

  • Soft shifts
  • Low line rise in Drive
  • High line pressure in Reverse

Cause:

These problems can be caused by severe wear of the boost valve sleeve, allowing EPC and reverse oil leakage.

Correction:

The Sonnax boost valve kit has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

U151E, U151F, U250E

Boost Valve Kit
Part No. 27741-01K

You need this if... View Instructions Find a Distributor

Toyota/Lexus vehicles with a U151E, U151F and U250E transmissions may exhibit insufficient line rise in drive ranges and excessively high pressures in Reverse. This may be caused by continuous oscillation of the steel boost valve within the cast aluminum sleeve, creating excessive wear and a path for EPC and Reverse pressures to leak. The Sonnax boost valve kit 27741-01K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

  • Boost sleeve manufactured from highly wear-resistant billet aluminum to prevent the excessive wear exhibited by the cast OE sleeve
  • Restores proper line rise
  • Valve
  • Sleeve
  • End 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/Lexus U151E/F, U250E Valve Body Layout

Toyota/Lexus U151E/F, U250E Valve Body Layout
  • U151E, U151F, U250E Boost Valve Kit 27741-01K
  • U151E, U151F, U250E Boost Valve Kit 27741-01K
  • U151E, U151F, U250E Boost Valve Kit 27741-01K details
  • U151E, U151F, U250E Boost Valve Kit 27741-01K details

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

U151E, U151F, U250E Boost Valve Kit Vacuum Test Locations