door alignment problem

[krazy_texan]

for the life of me, i can not keep my driver side door aligned correctly, i will align it and the next day it is sagging at the rear and currently ther is no gap at all at the back of the door and the the hinges are as far forward as i can possibly get them, could this be a problem with the door itself, it is a 72 door on a 67 cab but the passenger door is off of a 71 and i have no problems with it whatsoever, this is really starting to make me mad as it has damaged the door latch and i am going to have to replace it but i dont want to do so yet as i dont want to mess up another one, i am almost certain that the doors being different years has nothing at all to do with it but again i am unsure, could it be my door hinges, i am wanting to replace my rockers soon and fix a little bit of rust in the kicker and around the door sill soon but am unable to do so until i get my door on thier correctly.