November 24, 2015
Forward clutches in Ford 6R140 transmissions are applied in first through fourth gears in conjunction with other clutches. As the forward clutch regulator valve oscillates and strokes over time, bore deterioration results, allowing pressure loss that prevents proper hydraulic control of the forward clutches. This can cause no or delayed Forward, slipping, fluid overheat, burnt clutches, ratio or solenoid codes and failsafe operation.
Reconditioning the bore and installing Sonnax oversized forward clutch regulator valve kit 126740-13K restores normal shift action and clutch control for revived forward operation.
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 testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.