October 16, 2014
C1/K1 clutches in listed transmissions are applied in 1st through 4th Gears in conjunction with other clutch packs. As the C1/K1 clutch control valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the clutch pack. This can cause flares, slipping, erratic clutch apply timing, ratio codes and burnt C1/K1 clutches. Reconditioning the bore and installing Sonnax C1/K1 clutch control valve kit 15741-25K restores normal shift operation by re-establishing the hydraulic integrity of the C1/K1 circuit.
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.