Theres alot of kits out, like the scx stuff, tamiya stuff and rc4wd stuff but if you dont want to go that route, you can start gather parts. Start off with some axles, axials, although not perfectly scale, work great and still look pretty good imo. After you get axles and a tranny, pick a chassis, the X trail is a good cheap chassis to use too, then suspension and so on.
Proline has some dodge bodies, I think they have a mega cab if that will work. Wich with the right offset wheels, like 0mm offset 1.9's on axial axles, would prolly fit pretty good.
The scx kit is a good base though, build it, get rid of the lame body and go from there.