I put a nv 4500 in mine. Quad 4X4 has any thing you need.
http://www.quad4x4.com/catalog/category/nv4500_manuals
but all honestly you can do it with an exploded view of it.
This is the doge version but very similar was a big help
http://www.cumminsforum.com/forum/94...formation.html
It is a grate trany good for towing it is not a quick shifting trans though its a one ton. The nv3500 is an option if power levels are lower.
It is always more fun to shift then just sit their IMO.