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Symptoms:

  • B1 Clutch burned
  • C3 Clutch burned
  • Delayed Reverse
  • Low line rise in Reverse
  • Low Reverse boost
  • No Reverse
  • B4 Clutch burned
  • Reverse slip

Cause:

Persistent oscillation of OE steel boost valve within aluminum sleeve results in sleeve bore wear and loss of proper Reverse pressure.

Correction:

Recover hydraulic control and renew Reverse performance by installing Sonnax reverse boost valve kit.

U760E, U760F

Reverse Boost Valve Kit
Part No. 47740-38K

You need this if... View Instructions

Vehicles with Toyota/Lexus U760E and U760F transmissions may exhibit insufficient line rise in Reverse, delayed or slipping Reverse, and/or burned C3, B1, and B4 clutches. Continuous oscillation of OE steel boost valve within aluminum boost sleeve causes premature wear, creating a path for boost pressure to exhaust. Installing improved material Sonnax reverse boost valve kit 47740-38K restores the hydraulic integrity of the boost circuit to recover normal Reverse operation.

  • Restores proper line rise
  • Annular grooves help center valve in bore to reduce future side-load wear
  • Hardcoat anodized aluminum valve combats premature wear
  • Sleeve manufactured from highly wear-resistant aluminum to prevent excess wear and leakage
  • 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 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 38k combo
  • 47740 38k

You need this if...

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

  • 47740 38k test