The factory uses the PCM / Powertrain control module to shift the transmission up and down. There for if it is a 1/2 Ton truck you will have to put the 4L60E transmission back in it for the engine...
I hooked a tie down strap to the front hook on the engine (driver's side but towards the center of the car) and then down under the car. I unbolted the two front motor mounts and ratched the tie down...