4L60E 4L65E Sonnax 77898E-4K Boost Valve .470" 1993-2005 Early pump design .470

Description: 4L60E 4L65E NEW SONNAX 77898E-4K .470" REVERSE BOOST VALVE AND SLEEVE KIT 1993-2005 EARLY PUMP DESIGN. THIS IS A NEW NEVER OPENED SONNAX REVERSE BOOST VALVE AND SLEEVE KIT FOR THESE AUTOMATIC TRANSMISSIONS; GMC CHEVY BUICK CADILLAC OLDSMOBILE PONTIAC 4L60E 1993-2005 (EARLY PUMP ONLY) 4L65E 1993-2005 (EARLY PUMP ONLY) NOTE: Fits early style units with 1.907" long sleeve OE sleeve only. The 4L60-E, 4L65-E and 4L70-E transmissions will not function properly if the wrong early vs. late design assembly is installed. THIS KIT USES UPDATED O'RINGS TO SEAL BETTER AND HAS EPC SPOOL VALVE (INNER VALVE) DIAMETER OF .470" AND IS A STOCK REPLACEMENT for Early Pump Design, 1.907" Long Sleeve. COMPLAINT; Insufficient line rise 3-4 clutch failure Poor shift quality CAUSE; A worn boost sleeve can allow torque signal and reverse oil cross leakage or leakage to sump CORRECTION; These closely toleranced valve and sleeve kits restore hydraulic integrity and prevent leakage. This kits valves are in .470" increased boost ratio sizes.Sonnax valve and sleeve kits restore hydraulic integrity and prevent leakage. SONNAX PRODUCT SUMMARY; Vehicles with a 4L60-E transmission 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. Oil enters the torque signal orifice, leaks past the boost valve, and exhausts through the reverse orifice, resulting in poor line rise. Reverse oil can exhaust both to the sump and back through the torque signal orifice. Increased spool diameters (.470" EPC spool diameter), which will result in a higher boost ratio to raise line pressure and provide firmer shifts. The boost valves have been specially hard coated to eliminate excessive wear from occurring on the inside diameter of the sleeves. These boost sleeves have been manufactured from high quality aluminum, specifically designed to resist wear. Boost Valve Kit Part No. 77898E-4K Valve Sleeve O-Rings (2) Early pump design, .470" Dia., O-ring style Dia.: 0.470" Vehicles with a 4L60-E, 4L65-E or 4L70-E transmission 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 offers four versions of reverse boost valve and sleeve kits for early pumps.100% MADE IN THE USA THESE ARE THE PARTS THE PROFESSIONALS USE. 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Price: 81.2 USD

Location: Cerritos, California

End Time: 2024-11-06T20:51:21.000Z

Shipping Cost: 10.45 USD