Aisin Seiki AS66RC and AS69RC units often suffer overheating and converter slip/code issues caused by excess wear in the cooler, main converter pressure and converter relief bores. This wear allows fluid loss, which can lead to poor cooling, low cooler feed, low converter charge, TCC slip and TCC slip codes. When working properly, these valves dampen/absorb pressure spikes to ensure proper apply and release of the TCC.
Reconditioning the bores and installing Sonnax oversized cooler, main converter pressure and converter relief valve kit 122740-10K re-establishes correct clearances for proper valve function.

Steel valves combat premature wear
Annular grooves, where appropriate, help center the valve in the bore to reduce side-load wear
Springs calibrated to match OE function

More From This Category

Sonnax Servo Piston Kit, Powerglide, Each

Sonnax Servo Piston Kit, Powerglide, Each

$99.68

Sonnax Vacuum Test Gauge, All Automatics, Each

Sonnax Vacuum Test Gauge, All Automatics, Each

$100.74

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

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

$400.49

Sonnax Forward Clutch Hub Front Washer, GM, Th400/425, 4L80E/85E .078in. 5/B

Sonnax Forward Clutch Hub Front Washer, GM, Th400/425, 4L80E/85E .078in. 5/B

$75.76

Sonnax Mechanical Diode®, Multiple Applications, GM Stator To Fmx 29T Spline, Each

Sonnax Mechanical Diode®, Multiple Applications, GM Stator To Fmx 29T Spline, Each

$745.67