Description
4L60E / 4L65E / 4L70E Actuator Feed Limit Valve Kit, Sonnax 77754-09K.
In GM 4L60-E, 4L65-E and 4L70-E units, the AFL valve is a solenoid feed regulator valve that feeds the EPC solenoid and shift solenoids. The OE AFL valve design has a large reaction area and is highly affected by side-loading, which wears the valve body bore. The EPC solenoid oscillates the torque signal and AFL oil, which increases valve action. As the bore wear increases, oil pressure is reduced to the shift solenoids, which causes solenoid and ratio codes. The same AFL oil loss results in lower line pressure. The improved Sonnax actuator feel limit valve kit 77754-09K eliminates these problems.
- Hardcoat anodized aluminum valve combats premature wear
- Valve has annular grooves to prevent side-loading and has 54% more support by operating in the full contact sleeve
Tool kit 77754-TL also services the 4L80-E.
- Valve
- Sleeve
- Spring
- Retaining Clip
Symptoms:
- Wrong gear starts
- Solenoid performance codes
- Erratic line pressure
- Clutch failure
- Band failure
- No 4th
- Harsh shifts
- 2nd Gear starts
Cause:
Actuator feed limit bore wear results in low pressure at shift and EPC solenoids.
Correction:
Sonnax Sonnax actuator feed limit valve includes a redesigned AFL valve that regulates pressure and a wear-resistant sleeve to re-establish proper pressure control.
