GM 6T70 (Gen. 1) and 6T75 (Gen. 1) units often suffer shift abnormalities caused by excess wear in the actuator feed accumulator piston bores. This wear allows actuator feed limit fluid loss which prevents proper regulation of oil pressure supplied to control solenoids, resulting in harsh or soft shifts, solenoid codes and clutch failure.
Reconditioning the bore and installing Sonnax oversized actuator feed accumulator piston kit 124740-40K re-establishes correct clearance for revived shift control in all ranges.

Hardcoat anodized aluminum valve combats premature wear
Spring calibrated to match OE function

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