Mcdill

Hey everyone wanted to see if i could get some second thoughts on this to help me figure out what's going on. So it started when I had removed my transmission to replace my rear main seal for and oil leak that had occurred, well after putting it all back together it had started maybe once or twice and wouldn't go into gear and leave me with almost a click and then an electrical humming. Doing the old trick and connecting a wire to the starter and touching it to the positive on the battery, cranking it worked but still no gears. So thinking the torque converter wasn't properly lining up i had taken it apart again and made sure to secure it to the bell housing then clamp together and tighten it to the flywheel from there. put it back together (as of 3 days ago or so) it started up one time no gears though, then decided to not crank and give me that electrical humming while trying to crank it. I have replaced the battery, starter, starter relay and nothing has worked yet. So any thoughts on how i could fix it or what might be the problem here.