You can do some wiring to make it controllable via a switch like in the v6 models but it takes some parts and some work. Aaron's rig was a 97 so it has no PATS, yours has PATS so its gonna take a trip to the dealer or disabling PATS via a tune for it to work with the different GEM
http://www.explorerforum.com/forums/showpost.php?p=1250342&postcount=205
- GEM
- Bezel with switches
- Torque On Demand Relay
- Shift Relay
- T-case harness
- Wiring harness pins and plugs: StadX2 needed the wiring conntectors, which my local dealer gave me for free (They rock). However, my truck was 100% pre-wired, and they were not needed. This highlights the difference in wiring between my 97 and his 98, and why paying attention to "year ranges" is so important!
You can pull the shift motor off and manually turn it from under the rig each time but to make it a true selectable that you can change while in the cab is not gonna work. Best thing to do bang for the buck is to get a manual 4406 and do the swap. Besides the torque on demand clutch aren't the greatest thing.