I will at some point do a write up of the ESOF install with pictures and part numbers list but for the time being, here's a quick run down.
(This is in reference to using controls from a ~2008-2009 NV273...probably the simplest set up there is for this tcase)
You'll need:
-NV273 Transfercase
-Connector for shift motor (available through Motorcraft)
-Connector for encoder motor (available through multiple sources)
-Shift module and grey + black connectors (2008 F250 PN-8C3T-14B205-AB)
-Mode select switch and connector
-2 12V automotive relays
-small aux fuse panel (I use this rather than trying to find empty fuses in the van)
The tcase has the two wires from the shift motor going to the two relays (we mount relays under the hood, left side of inner fender). Then 6 wires from the encoder motor to where the shift module is located (inside the van).
The switch will get a dash light wire, two wires to the control module and a ground
The shift module will need these inputs:
-12V+
-Ign 12V+
-GND
-VSS (see van's wiring diagram for easiest place to tap into this)
-Neutral indicator (essentially, the module is looking for a ground when in park or neutral)
-Brake switch
The module outputs to:
-4wd hi light (this wire goes to ground when in 4 hi)
-4wd lo light (this wire goes to ground when in 4 lo)
-6 wires to encoder
-2 wires to the vacuum hub solenoid
-2 wires to the mode select switch
-2 wires to control the relays
The vacuum hub solenoid has the two inputs from the shift module plus a 12V+ source. You "T" into the vacuum line running across the top of the firewall (it goes back behind the heater to a vacuum reservoir) and run the vacuum line to the solenoid. The other line splits to the two hubs. check valves before the solenoid and after the solenoid but before the split to the two hubs are needed (just like Fseries set up).
That's all there is to it.