October 16, 2014
B1 clutches in listed transmissions are applied in 2nd and 6th Gears in conjunction with other clutch packs. As the B1 clutch control valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the B1 clutch pack. This can cause flares, harsh shifts, slipping, erratic clutch apply timing, ratio codes and burnt B1 clutches. Reconditioning the bore and installing Sonnax oversized B1 clutch control valve kit 15741-61K restores normal shift operation re-establishing the hydraulic integrity of the B1 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 test(s) at the port(s) indicated fail to hold the recommended minimum in-Hg.