Transfer case?
 

Long story short went muddin, and one of the many things i messed up, the truck wouldnt move, hopfully its just the brakes locked or something, but i got reverse, it acts like it will go forward but it dont cause of the brakes i think, i took a gander at the drive shaft and i was able to turn it by hand, anyways i took it off, but before i did tried 4h 4l and 2w and they all seemed to get in good, but my question is why could i be able to turn the drive shaft by hand? i had changed the engine oil befor we went, but didnt change the tranny oil but it looked good.

Thanks

possibly your transfer case, had same issue, turned out to be transmission.