GM 4L60E / 4L65E Boost Valve & Sleeve Kit
GM 4L60E / 4L65E Boost Valve & Sleeve Kit is backordered and will ship as soon as it is back in stock.
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Sonnax boost valve kit 77898E-K is an increased ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-design pumps. OEM ratio .490" (O-ring style) with 1 ID groove on end. (Note: Late 4L60E, 4L65E, and 4L70E units will not function properly if the wrong valve is installed).

