Sonnax 4L60E 4L65E Boost Valve Kit .490\" O-Ring Style 77898E-K For Sale - New and Used

Sonnax 4L60E 4L65E Boost Valve Kit .490" O-Ring Style 77898E-K4L60-E, 4L65-EBoost Valve KitPart No. 77898E-KEarly style, .490" dia., increased ratio, O-ring styleGM 4L60-E and 4L65-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle of the EPC solenoid causes the boost sleeve to wear quickly. Oil entering the torque signal orifice leaks past the boost valve and exhausts at the Reverse orifice, resulting in poor line rise. Reverse oil can exhaust both to the sump and back through the torque signal orifice. The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise.Sonnax boost valve kit 77898E-K is an increased ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-style pumps. Drop-in Zip Valve™ parts install quickly and easily. See chart for usage details and other boost valve (2)

Valve .490", No Groove

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• Valve .490", No Groove

4L60-E, 4L65-EBoost Valve KitPart No. 77898E-KEarly style, .490" dia., increased ratio, O-ring styleGM 4L60-E and 4L65-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle of the EPC solenoid causes the boost sleeve to wear quickly. Oil entering the torque signal orifice leaks past the boost valve and exhausts at the Reverse orifice, resulting in poor line rise. Reverse oil can exhaust both to the sump and back through the torque signal orifice. The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise.Sonnax boost valve kit 77898E-K is an increased ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-style pumps. Drop-in Zip Valve™ parts install quickly and easily. See chart for usage details and other boost valve (2)

Valve .490", No Groove

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