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:

Ream the valve bore to restore bore geometry and surface finish. Install the Sonnax oversize valve and matched spring.

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

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


You need this if... View Instructions Find a Distributor

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.

  • Hard-coat anodized aluminum valve resists wear
  • New matched spring maintains OE operating pressures and timing
  • Valve
  • Spring
  • 4L60-E, 4L65-E, 4L70-E Oversized 3-4 Shift Valve Kit 77754-42K
  • 4L60-E, 4L65-E, 4L70-E Oversized 3-4 Shift Valve Kit 77754-42K

You need this if...

A wet air test or a vacuum test at indicated valve body locations result in leakage or below recommended in-Hg levels.

  • 4L60-E, 4L65-E, 4L70-E Oversized 3-4 Shift Valve Kit Vacuum Test Locations