Symptoms:

  • 2nd & 6th Gear shift concerns
  • B1 Clutches burned

Cause:

Wear at the B1 apply boost valve and sleeve can allow the B1 apply control valve to stroke prematurely, resulting in 2nd and 6th gear shift complaints and a burned B1 brake.

Correction:

This Sonnax B1 apply boost valve kit has upgraded materials and tighter clearances to prevent wear and restore proper hydraulic control.

U660E, U660F

B1 Apply Boost Valve Kit
Part No. 47740-19K

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

Vehicles with Toyota/Lexus U660E, U660F transmissions may exhibit 2nd and 6th gear shift complaints and a burned B1 brake. These problems may be caused by continuous oscillation of the steel B1 apply boost valve within the cast aluminum boost sleeve, creating excessive wear and a path for line pressure to exhaust and the B1 apply control valve to stroke prematurely.

Sonnax B1 apply boost valve kit 47740-19K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

  • Boost sleeve is manufactured from highly wear-resistant billet aluminum to prevent excessive wear
  • Restores proper line rise
  • Valve
  • Sleeve

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 U660E/F, U760E/F Valve Body Layout

Toyota/Lexus U660E/F, U760E/F Valve Body Layout
  • U660E, U660F B1 Apply Boost Valve Kit 47740-19K
  • U660E, U660F B1 Apply Boost Valve Kit 47740-19K

You need this if...

A vacuum test at the port indicated fails to hold at least 18 in-Hg.

U660E, U660F B1 Apply Boost Valve Kit Vacuum Test Locations