Technicians would like to find a way to successfully extend the life of 3-4 clutches, and improve the 2-3 shift feel. They have been trying, with limited success, since the GM 4L60 (TH700-R4) and 4L60-E series transmissions were introduced. Inadequate metering of 2nd gear band servo release oil causes 3-4 clutch failure. The 3-4 clutch and 2nd Gear band are not properly synchronized. Sonnax servo release check valve kit 77701-076 is a unique solution that combines an orifice with a ball check valve to resolve these problems.

Improved design meters servo release oil, reducing 3-4 clutch failure
Provides sufficient exhaust so that 3-2 downshifts are smooth
Calibrates 3-4 clutch feed orifice without creating shift concerns
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