Transmission Parts GM 4L70-E 4L60-E 4L65-E Valve Body Valve / Sleeve

Symptoms:

2nd Gear starts
Low AFL pressure
3rd Clutch failure
3-4 Concerns

Cause:

Wear at the shift valve spools and bore lands allows loss of critical hydraulic pressure. Typically wear is most severe at the signal A spool/land.

Correction:

Recondition the bore and install Sonnax oversized 3-4 shift valve kit.

4L60-E, 4L65-E, 4L70-E

Oversized 3-4 Shift Valve Kit
Part No. 77754-42K

Tooling:

F-77754-TL42
VB-FIX

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In GM 4L60-E, 4L65-E abd 4L70-E units, wear at the shift valve spools and bore lands causes loss of critical hydraulic pressure which, depending on the wear location and severity, can result in shift timing/feel complaints, 2nd Gear starts, 3rd clutch failure, 3-4 shift complaints and loss of AFL pressure. Reconditioning the bore and installing Sonnax oversized 3-4 shift valve kit 77754-42K restores hydraulic integrity.