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Symptoms:
  • High line pressure in Reverse
  • Low line rise in Drive
  • Soft shifts
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 assembly has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

U151E, U151F, U250E

Boost Valve Kit

Part No.

27741-01K

Boost Valve Kit
  • 27741-01k_combo

  • Boost Valve Kit

Small_27741-01k_combo Small_27741-01k

U151E, U151F, U250E

Boost Valve Kit

Part No. 27741-01K

  • Valve
  • Sleeve
  • Plug

Complaint:

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

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 assembly has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

Toyota vehicles with a U151E/F, U250E transmission may exhibit insufficient line rise in the 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 replacement boost valve assembly, 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.
  • Salvages expensive valve bodies.
  • Restores proper line rise.

Related Parts

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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 U151E/F, U250E

Related Tech Articles

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