It does not want to crank over

It started about one month ago when my bar popped off broke my housing on my transmission. So I replaced the u joints and put another transmission on but I took it off a truck. Well my suburban was running for a week then my bar popped off again! So I was like for reals I know I put them on right. Well come to find out the bar was unbalanced that is why it popped off again. So I replaced them put another drive line on but after that I turned it on all you would hear is like some banging against each other like the starter going really fast. After that day it started doing that. Well my brother law helped me pull it to my dad's ranch and he ended up breaking one like to the transmission the one to the break pulled my wires from the break harness by the computer but not all the way off l! So I changed the alternator got a new battery starter. Well it's been like two weeks since it turned on. The last time I turned it on it cranked just fine but went to shut the hood turned off since then no crank no start none of the gauges work, but stereo lights work. So I replaced the starter relay yesterday fuel pump relay still none. So I attached a wire from the little wire from the starter try cranking it by putting the wire on the positive side it cranks but does not turn on! Can you help me figure it out please?