Transmission seems like it does not want to shift

Okay, so I have the vehicle listed above and one morning I went outside to start it up since it was cold, well I went back out and there was transmission fluid all over the ground, so I turn the truck off. So after I looked and there was a tube hanging in the front it was disconnected I later found out it was a cooling tube that connects to the radiator to the transmission. Well I also notice it was broke before and the owners you owned before us just clamped it back on. So I just went out and brought a new clamp and fluid. I connected the tube tighten the clamp added transmission fluid. It was shifting okay but now that I just tried to go for a ride it seems as if it does not want shift at all now. So I’m a little confused on what to do or what is going on! So please help me out.