Transmission Parts Toyota/Lexus A340 A340E A340F A340H Valve Body Valve / Sleeve

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Symptoms:

Delayed engagement
Low line rise
Low line pressure in Reverse
High line pressure in Reverse
Erratic line pressure
Soft upshifts
Repeated clutch failure

Cause:

Severe wear of the boost sleeve allows TV and boost oil leakage.

Correction:

Sonnax drop-in boost valve kit restores hydraulic integrity and prevents cross-leaks.

Warning:

To ensure correct part is ordered, measure OE valve spools and compare dimensions.

Part Number	Large Spool	Small Spool
97855-23K	.566 dia.	.523 dia.
97855-30K	.546 dia.	.480 dia.

A340, A340E, A340F, A340H

Boost Valve Kit
Part No. 97855-23K

Fits Type 1 (8931 casting code) with .566" dia. large spool.

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The steel OE valve in Toyota/Lexus A340 and A340E/F/H Type 1 transmissions moves within the cast aluminum sleeve, wearing the sleeve. After this wear becomes severe, the valve no longer operates properly, causing soft upshifts and delayed engagement. Sonnax boost valve kit 97855-23K restores hydraulic integrity and prevents cross-leaks.

Sleeve made from high-quality aluminum for better wear resistance
Hardcoat anodized aluminum valve combats premature wear
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

Contents

Valve
Sleeve
Shims (3)

Valve Body Layout

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.