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  • 1-2 Long slide
  • B1 brake clutches burned
  • Clutch failure
  • Low line pressure


Wear at the B1 apply control valve or boost valve/sleeve can cause improper function of the B1 apply control valve, leading to incorrect clutch pressure. Line pressure acts in multiple locations at this valve, so excessive wear can lower line pressure.


Reaming the bore and installing the Sonnax oversized B1 apply control valve kit will reduce line pressure losses, and restore proper function of the B1 apply control valve, restoring proper clutch pressure.

U760E, U760F

Oversized B1 Apply Control Valve Kit
Part No. 47740-44K

You need this if... View Instructions

In Toyota U760E/F transmissions, the B1 brake clutch is applied in 2nd and 6th Gears. The B1 apply control valve redirects line pressure to the brake clutch. Wear at the valve and/or boost valve and sleeve can cause improper valve function, and in extreme cases, reduction in line pressure. Reaming the bore and installing the Sonnax oversized B1 apply control valve kit 47740-44K will control line pressure losses and restore valve function.

  • Sleeve manufactured from highly wear-resistant aluminum
  • Hardcoat anodized aluminum valves combat premature wear
  • Annular grooves help center valve to reduce side-load wear
  • Properly calibrated spring to match OE pressures

  • B1 Apply Control Valve
  • Spring
  • Boost Valve
  • Boost Sleeve

October 26, 2017

Toyota/Lexus U760E/F Vacuum Test Guide

Topics: Vacuum Test Guides Transmission Toyota/Lexus U760F Transmission U760E Transmission

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  • 47740 44k combo
  • 47740 44k

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.

  • 47740 44k in test