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

Sonnax Pump Gear Set, Ford, E40D '95-Up, F5/8 Pumps, 4R100, Each

Sonnax Pump Gear Set, Ford, E40D '95-Up, F5/8 Pumps, 4R100, Each

$89.11

TCI Automatic Transmission Adapter, For Chevrolet Transmissions to B.O.P Engine, For Buick, For Oldsmobile, For Pontiac Engines, Each

TCI Automatic Transmission Adapter, For Chevrolet Transmissions to B.O.P Engine, For Buick, For Oldsmobile, For Pontiac Engines, Each

$182.88

Sonnax Secondary Pulley Rear Bearing, JF015E (Re0F11A), Each

Sonnax Secondary Pulley Rear Bearing, JF015E (Re0F11A), Each

$90.73

TCI Automatic Transmission Input Shaft, High Performance, 300M, 30-spline, GM, 700R4, 4L60E, Each

TCI Automatic Transmission Input Shaft, High Performance, 300M, 30-spline, GM, 700R4, 4L60E, Each

$1,591.70