Aisin Seiki AS68RC units often develop converter-related issues caused by excessive wear in the cooler blow-off valve bore located in the upper valve body casting. Once worn, leakage causes low cooler flow, overheated converter fluid and eventually converter damage.
Reconditioning the bore and installing Sonnax oversized cooler blow-off valve 99740-06 re-establishes correct clearances for proper hydraulic functions, salvaging these very expensive and hard-to-find valve bodies.

Hardened steel valve combats premature wear
Oversized valve is recalibrated to meet original OE pressures using the OE springs

More From This Category

Sonnax Supported Servo Pin & Cover Kit, GM, Powerglide, Each

Sonnax Supported Servo Pin & Cover Kit, GM, Powerglide, Each

$184.61

Sonnax Impeller Hub, GM, Comp GM-Rk-685, 688 & Wc, Each

Sonnax Impeller Hub, GM, Comp GM-Rk-685, 688 & Wc, Each

$105.02

Sonnax Thrust Bearing, GM 6T40/6T45, Each

Sonnax Thrust Bearing, GM 6T40/6T45, Each

$25.46

Sonnax Bore Sizing Tool, GM, For 154740-11K, Each

Sonnax Bore Sizing Tool, GM, For 154740-11K, Each

$400.49

Sonnax Flange Yoke, 1480 Series, Each

Sonnax Flange Yoke, 1480 Series, Each

$249.69

Sonnax Impeller Hub, Ford 6F35, Early, Each

Sonnax Impeller Hub, Ford 6F35, Early, Each

$35.55