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  • Harsh downshifts
  • RPM fluctuation
  • TCC apply & release concerns
  • TCC slip codes


Wear at the lockup control valve bore and plunger/sleeve assembly results in loss of hydraulic control, creating TCC engagement and timing issues.


Recover hydraulic control and renew TCC performance by reconditioning bore and installing Sonnax oversized lockup control valve kit.

U760E, U760F

Oversized Lockup Control Valve Kit
Part No. 47740-31K

You need this if... View Instructions

Toyota/Lexus vehicles equipped with U760E and U760F transmissions often exhibit several common concerns related to wear in the lockup control valve bore. Oscillation of the lockup control valve and stroking of the plunger valve in its sleeve results in wear that prevents full hydraulic control of the lockup circuit. TCC slip, RPM surge, harsh downshifts and/or slip codes can accompany the TCC apply/release concerns that develop in these cases. Sonnax oversized lockup control valve kit 47740-31K allows the bore to be refurbished, restoring normal TCC operation.

  • Hardcoat anodized aluminum valves combat premature wear
  • Annular grooves help center valves in bore and sleeve to reduce future side-load wear
  • Control Valve
  • Spring
  • Plunger Valve
  • Plunger 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 U660E/F, U760E/F Valve Body Layout

U660ef vbl thumb

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • 47740 31k combo
  • 47740 31k

You need this if...

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

  • 47740 31k in test