ATI's new Super Servo gives the ability to increase the servo bore from the stock 2.750'' bore to 3.250'' on any OEM or aftermarket Powerglide case. This increases the servo pistons apply area nearly 30% from 5.93 square inches to 8.29 square inches. With this additional area you are now able to increase the band's clamping force equal to what you would have running 300psi of line pressure, however you only need 215psi to do so!