Boost valve assembly

An improved boost valve assembly for use in combination with a pressure regulator valve within the valve body of an automatic transmission, wherein the original equipment boost valve assembly comprises a torque signal valve piston responsive to fluid pressure from the torque signal fluid circuit and a park/reverse/neutral valve piston responsive to park/reverse/neutral fluid pressure from the park/reverse/neutral fluid circuit, said valve pistons positioned within a valve sleeve in end-to-end relation with the pressure regulator valve, wherein the improvement comprises:

• a replacement torque signal valve piston having an increased axial length in comparison to the original equipment torque signal valve piston without a corresponding increase in the overall axial length of the original equipment boost valve assembly;
• a plurality of circumferential channels formed about said valve sleeve at predetermined axial locations corresponding to the positions of said torque signal fluid circuit and said park/reverse/neutral fluid circuit, said circumferential channels delivering the flow of hydraulic fluid about the circumference of said valve sleeve;
• and
• an array of fluid ports formed within each of said circumferential channels in fluid communication with said torque signal valve piston and said park/reverse/neutral valve piston to increase the flow of fluid pressure from said torque signal fluid circuit and said park/reverse/neutral fluid circuit into said boost valve assembly.