- 2nd Gear starts
- Broken AFL filters
- Code 68, 85, 86, 87
- Leaking AFL end plug
- No upshifts
Damaged AFL filter or leaking end plug causes driveability problems and/or trouble codes.
Renew AFL operation and restore shift control by installing Sonnax AFL filter end plug & O-ring kit.
AFL Filter End Plug & O-Ring Kit
- End Plug
- End Plug O-Ring
- AFL Filter O-Ring
GM 4L80-E and 4L85-E transmissions may have 2nd gear starts and no upshifts, which can be accompanied by trouble codes 68, 85, 86 and/or 87. These problems can often be traced to a leaking actuator feed limit (AFL) filter or end plug. Installing Sonnax AFL filter end plug and O-ring kit 34994-17K eliminates these problems by restoring hydraulic control to the circuit.
For a more comprehensive AFL circuit repair, recommend also installing Sonnax actuator feed limit valve kit 34200-16K.
- End plug manufactured from highly wear-resistant aluminum
- O-rings positively seal bore to prevent leakage