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  • Burnt brake clutches
  • Burnt clutches
  • Shift concerns
  • Lockup concerns


Wear of the end plugs allows valuable line pressure and SLT pressure to leak at the various valve bores.


These Sonnax O-ringed end plugs restore correct circuit pressures. The O-ring provides additional sealing to reduce hydraulic losses at critical circuits.

U660E, U660F, U760E, U760F

O-Ringed End Plug Kit
Part No. 47740-21K

You need this if... View Instructions

The end plugs at the various valves are designed to seal line pressure and SLT pressure that is critical in controlling component apply pressure during shifts at various throttle pressures. When this fluid pressure is allowed to leak due to plug wear, various shift complaints and burnt clutches occur within those specific circuits. Loss of pressure at the secondary regulator valve and lockup relay valve plugs also prevents proper control of the converter circuit, creating lockup complaints.

Sonnax O-ringed end plug kit 47740-21K restores correct circuit pressures in Toyota/Lexus U660E/F, U760E/F units. The O-ring provides additional sealing to reduce hydraulic losses at critical circuits.

  • No special tools required
  • Minimal end plug-to-bore clearance with added O-ring for positive seal
  • End Plugs, Small (6)
  • O-Rings, Small (9) 3 Extra
  • End Plug, Large
  • O-Rings, Large (2) 1 Extra

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

December 09, 2013

Toyota/Lexus U660E, U660F, U760E, U760F Identification Guide

Topics: Identification Guides Transmission Toyota/Lexus U760F Transmission U660F Transmission U760E Transmission U660E Transmission

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December 30, 2013

Toyota/Lexus U660E/F Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission Toyota/Lexus U660F Transmission U660E Transmission

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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 21k combo
  • 47740 21k

You need this if...

A vacuum test at the ports indicated fail to hold at least 18 in-Hg.

  • 47740 21k in vactest