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  • Burnt converter
  • Bushing wear
  • Converter concerns
  • Overheated transmission
  • Lube failures


Oscillation of the steel secondary pressure regulator valve within the aluminum casting causes wear, which will allow converter feed oil to leak to exhaust and not supply the lube circuit, resulting in converter complaints, burnt apply components and lube related failures.


Restore proper hydraulic control by refurbishing the bore and replacing worn components with the oversized Sonnax valve kit.

A340E, A340F

Oversized Secondary Pressure Regulator Valve Kit
Part No. 97741-18K

Fits '00-Later V6 & V8, late models, Type 3 & 4 valve bodies.

You need this if... View Instructions

The secondary pressure regulator valve in Toyota A340E/F late units receives regulated line fluid pressure from the main pressure regulator valve, and routes it to the converter and lubrication circuits. The continual oscillation of the steel valve within the aluminum casting creates wear, allowing this valuable fluid pressure to exhaust, resulting in converter complaints, burnt apply components and lube-related failures. The Sonnax oversized secondary pressure regulator valve kit 97741-18K restores proper hydraulic clearance in a refurbished bore and includes an O-ringed end plug to positively seal the balance pressure circuit.

  • Valve is hardcoat anodized to reduce wear
  • O-ringed end plug positively seals the balance pressure circuit
  • Valve
  • End Plug
  • O-Rings (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/Lexus A340E/F Valve Body Layout

A340e f vbl thumb

January 16, 2014

Toyota A340E/F Identification Guide

Topics: Identification Guides Transmission Toyota/Lexus A340E Transmission A340F Transmission

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August 21, 2013

Toyota A340E/F, '00-Later Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission Toyota/Lexus A340E Transmission A340F 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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  • 97741 18k combo
  • 97741 18k

You need this if...

Vacuum tests at the ports indicated fail to hold at least 18 in-Hg.

  • 97741 18k vactest