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Sonnax GM 4L60E Transmission Reverse Boost Valve and Sleeve .490 4L65E 4L60-E 4L65-E
OPT Product Code: SNX-77898E-3K$46.81
Product Details
Vehicles with a 4L60-E 4L65-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 has developed two reverse boost valve and sleeve kits, 77898E-K for oversized (.490 EPC spool diameter) with O-rings and 77898E-3K is a factory style sleeve.
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