• Harsh lockup
  • TCC apply & release concerns
  • Burnt converter
  • Lube failures


Severe wear of the valve and bore allowing EPC and/or balance pressure loss.


The Sonnax oversized secondary pressure regulator valve kit with upgraded materials and minimal clearances prevents wear and restores proper hydraulic function.

A750E, A750F, A760E, A760F, A760H, A761E, A960E, A960F, AB60E, AB60F

Oversized Secondary Pressure Regulator Valve Kit
Part No. 147741-10K

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

The continuous oscillation of the secondary pressure regulator valve in Toyota/Lexus A750, A760, A960 and AB60 series units wears the valve spools and valve body bore at the contacting surfaces. This wear results in TCC pressure irregularities and valve instability. If pressure is high, harsh lockup clutch engagement can result. If the pressure is too low, the TC clutch cannot achieve complete lockup. Continuous clutch slippage will lead to burnt clutch material and converter. Under these conditions, loss of mileage and poor drivability are to be expected.

Sonnax oversized secondary pressure regulator kit 147741-10K includes a high-quality steel valve with annular grooves to reduce side load wear and extend valve and valve body life. Sonnax tool kit F-147741-TL4 was designed as a multipurpose tool. Used in conjunction with our VB-FIX reaming fixture, both the main pressure regulator bore and the secondary pressure regulator bore can be reamed and prepared for their respective kits: 147741-10K and oversized pressure regulator and boost valve kit 147741-04K.

  • Valve is made from high quality, hardened steel to resist wear
  • Inner spool has annular groove to reduce side-loading
  • Valve
  • End Plug

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 A760E/F/H Series Valve Body Layout

A760e f h vbl thumb

Toyota A750E/F Series Valve Body Layout

A750e f vbl thumb

January 16, 2014

Toyota A750E-A761E Identification Guide

Topics: Identification Guides Transmission Toyota/Lexus A760H Transmission AB60E Transmission AB60F Transmission A761E Transmission A750F Transmission A760E Transmission A750E Transmission A760F Transmission

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December 03, 2013

Toyota/Lexus A750E/F, A760E/F/H, A761E Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission Toyota/Lexus A760H Transmission A761E Transmission A750F Transmission A760E Transmission A750E Transmission A760F Transmission

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  • 147741 10k combo
  • 147741 10k  1

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.

  • 147741 10k in test