I just picked up a flipped dana 300 with all the twin stick equipment for next to nothing, I am running a np 231 right now on my 1988 jeep xj. I am wondering what adapter plate and what input shaft I need to buy in order to make a 231 to dana 300 doubler. If anyone has a seller or tips on how to make this doubler combo as efficient as possible, please chim in.

Other info ( front driver side dana 44, rear 60 ( both molly axles ) and 4.0 engine with standard automatic tranny)

~Thanks

Easiest would be to just buy the box4rocks kit, or the madrooster kit, and be done with it. I'm thinking about doing the same thing with my jeep after I go propane injection, so I have room to extend my wheelbase, with no gas tank in the way.
Scott