I am looking at doing something like this. I have a 1993 Aerostar AWD. I have a 99 Explorer that I will be using. It started out as needing a new engine and progressed into also wanting to get the larger brakes and fix the rearend squat.
So, the way it is now, I am going to use as much of the Explorer engine/tranny and running gear that I can. It has the SOHC engine so I will be using the wiring and OBDII computer and everything else I can.
Now that you have been using your van for a while, can you give any pointer or things you would have done differently?
How are the Aerostar chassis/framemembers holding up in the back where you attached the rear axle?
I probably won't be going as high as you did. Mine will still be the family daily driver/grocery getter. But, I will use it to go camping other fun stuff. Hoping to get 31" tires on it.