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
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

More From This Category

TCI Speedometer Gear, Driven, 44-Tooth, Gray, GM Turbo-Hydromatics, Each

TCI Speedometer Gear, Driven, 44-Tooth, Gray, GM Turbo-Hydromatics, Each

$49.76

TCI Solenoid, Trans-Brake, Steel, Natural, For Ford, C-4, Each

TCI Solenoid, Trans-Brake, Steel, Natural, For Ford, C-4, Each

$319.87

Wilwood Bearing Cone, Stock Hub, Inner

Wilwood Bearing Cone, Stock Hub, Inner

$37.27

Sonnax Ain. Hub Front Bushing, BMW, ZF8Hp45/50/55/70/75, 845Re

Sonnax Ain. Hub Front Bushing, BMW, ZF8Hp45/50/55/70/75, 845Re

$44.10

TCI Speedometer Gear, Drive, 15-Tooth, Olive Green, GM 700R4, Each

TCI Speedometer Gear, Drive, 15-Tooth, Olive Green, GM 700R4, Each

$49.76