The transmission has be purchaced. From the Toy Box in Pomona CA. It is a 4-speed overdrive GM 700R4 moderate shift kit and an 1800 stall speed torque converter. That is one reason I am using the 3.7 rear end ratio, the 3.7 combined with 28 inch tall tirand .70 overdrive gives an adequate top end with tire smoking first gear Go here for some transmission info