Take the transmission hump section out of the floor. Usually held in with screws. Get two 4x4 lengths of wood that will sit secure on the floor board. Get two heavy ratchet tie downs straps and wrap them around the transmission and 4x4's and ratchet away until you can line up the transmission shaft with the pilot bushing in the crankshaft. Then shove the transmission home making sure you line up the locating pins on the bell housing.
Tim
