I have a 97 DodgeRam 5.2L automatic just replaced tranmy now wont shift properly

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Ok so, i have a 1997 Dodge Ram 4x4 with a 5.2L V8 automatic. And i just replaced the transmission, but i haven't been able to start it or drive it yet because for some reason when i go to shift it from (P)park to (R)reverse and then (N)nutural to (D)drive then (2nd) to (1st) it shifts WAY to easy. And doesn't feel like its really shifting at all. But all of the linkages are hooked up tho. And then i go to put it all the way back up to (P)park it makes a clunking sound each time that i shift it from (1st) back up to (P)park. And it sounds like the clunking noise is on the firewall like by the steering column. Does anybody have any idea what it could be? Please let me know. Thank you!