Transmission troubles?

Okay, my flywheel started going bad like to the point to where it was messing my starters up even when I would go buy a brand new one. So, I decided to change the flywheel. So, I had to pull the transmission off the truck to do so the transmission worked perfectly fine the whole time I had the truck up until I took the transmission off replaced the flywheel put the torque converter back on folded it to the flywheel and then mounted the transmission back to the motor, put all the lines back where they're supposed to be I think. I put the vacuum line where it's supposed to be I'm almost positive I did all the wiring harnesses are hooked up full of fluid when I bolted it back on and it starts up just fine when you put it in reverse the first time and took the e-brake off and let off the regular brake pedal I could floor it and it wouldn't go in reverse it acted like it wanted to but it acted like something was holding it back and keeping it from going in reverse well I jacked it up and took the ramps out from under it and got it on level ground and put it in reverse and it just freely like it was in neutral but it was in reverse and did the same thing in first second drive and overdrive and I can't understand what could have happened or what I could have done wrong for it to start doing that.