Turbo 350 wont shift

[jhiggy94]

I am nearing the end of my build of my 72 K20 and i wanted to see if the truck would move on its own power. It has the TH350 trans with the stock 350 engine. The truck starts fine but when i shift out of park nothing happens. ( its an automatic btw). I did take out the steering column at one point would me not reinstalling this cause this problem? I did not touch the engine or trans at all during the build. When I have it in 4Low then when i shift into reverse it feels like it shifts ( the truck jerks backward a bit) but when i press the gas still nothing happens. It just revs up like it was still in park. Thanks for any help
Jake