I was wondering what is the best shift kit for a 3.9 L dodge dakota 97 4x4. I am going to replace all the seals and everything in the valve body, so I am also wondering what is included in the shift kit. Is all the gaskets? Seals? etc..? I want to rebuild the valve body and bring it above specification, and I think a o ring or something is leaking so where can I pick up all of the replacable parts (other than electronic) or are they included in a shift kit.