PRIMARY REGULATOR BOOST VALVE KIT
# 78791K

Primary Regulator Boost Valve Kit

PRIMARY REGULATOR BOOST VALVE KIT

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.


Toyota/Lexus vehicles with U140E, U140F, U240E and U241E transmissions 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. Sonnax boost valve kit has upgraded materials to prevent wear and to 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

Content:

  • Valve
  • Sleeve
  • Plug

SONNAX Installation Instructions

Type of Product: Sundry Parts
Qty Needed:
Years:
Alternative #:
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