GM 9T45/50/60/65 transmissions may exhibit multiple line pressure and converter-related problems due to high wear in the main pressure regulator boost valve sleeve bore. Sonnax pressure regulator boost valve kit 184740-02K has upgraded materials and minimal clearances to prevent wear and restore boost valve functionality for proper line pressure.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.