October 31, 2014
OE end plugs are designed to prevent critical pressure loss by capping the bore, while also functioning as a spring or valve stop. Repetitive spring motion, valve impact and fluid pressure variations cause wear between the end plug and bore mating surface, allowing vital pressure to escape the circuit.
GM Gen. 1 6T30/40/45/50 valve bodies have end plugs at the various clutch regulator valve bores which are susceptible to this wear. When actuator/solenoid feed pressure is allowed to leak due to plug deterioration, various shift concerns and burnt clutches will result in the affected circuit. Wear at the TCC regulator and clutch select valve end plugs allows valuable oil loss that leads to drivability concerns. Correct leackage and restore hydraulic integrity by installing Sonnax O-ringed end plug kit 144740-02K.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum tests at the ports indicated fail to hold the recommended minimum 18 in-Hg.