Dodge 2nd gen auto to nv4500

Dodge 2nd gen auto to nv4500

Thinking about swapping my auto to a nv4500, any tips or where the best place to find a old trans or truck with one, I’ve check all the junk yards around me and they either have a auto or the manual is gone, also I don’t hual anything, would the nv4500 be the cheaper better option then the nv5600