I have a stock 700R4 with a TCI Saturday Night Special torque converter with about 2000 stall speed. I want my tranny to shift better, harder and more percise but I don't want to take the tranny out of the car. What are the best shift kits and other modifications to do.

 

Install a TransGo Reprogramming Kit and make sure that you have at least the V-8 Servo (553) or you can use the 'Vette Servo (093). Your boost valves should be fine already.