October 31, 2014
GM 6T40, 6T45 and 6T50 first generation transmissions may exhibit multiple line pressure and converter-related problems due to high wear in the main pressure regulator bore. Wear at the balance spool end allows critical fluid loss, resulting in excess line pressure, harsh shifts, and reduced cooler/converter flow. Wear at the outboard spool robs converter feed pressure and lowers line pressure, resulting in soft shifts and burnt clutches. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 144510-01K restores hydraulic integrity for proper line pressure control in all ranges.
Must use 1/2" or thicker spacer plate between pump body and VB-FIX; see instructions for details.
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.