I am putting a 700 R4 Tranny from a 1985 Astro Van into my 1984 CHevy Suburban, what all do I need to change out? I got it in but now it won't start. Thanks Burley

the battery?? I'm just kidding, is the engine not starting, turning over, what are the specifics?

neutral switch on your burb should be on the column,to see if its out,with your foot on the brake turn the key to crank and move your shifter through the gears.