GM 4L60E / 4L65E "Factory" Style Boost Valve Kit OEM

Sonnax boost valve kit 77898E-6K is a large OE ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-design pumps. Performance ratio .470' (OEM STYLE) 1 ID groove on end (Late 4L60E,4L65E & 4L70E will not function properly if work valve is not installed.