I have the crazy idea of putting everything on mine and make it 4wd, and as I see now.....I MIGHT not need the computer reprogramed...but I know
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hmm didnt know that..well i wont try to make mine a 4wd
I didn't see you had a 2WD. My knowledge is from a t-case swap, rather than an afterthought installation. I was assuming that you were after the same. Having been through the KJ's front suspension more times than I ever wanted I can tell you that you are nuts. Not just from a money stand point, but from an effort stand point.
That said, my experience with MOPAR products is that they install the same wiring in every vehicle, regardless of the actual installed options. For instance, My KJ did not have heated mirrors, but everything I needed to install them & make them work like they were always there, was there. I bought a new '96 Dodge Neon with no sound system, so I could install my own aftermarket setup, but all the wiring for the head unit & speakers were still installed. This makes sense from a production standpoint. So I would not be surprised if your 2WD KJ has the wiring installed for the position sensor. I also wouldn't be surprised if your ECU already was programmed to receive the signal. Might not, but I wouldn't be surprised if it did.
That said here's my advice: 1) do what everyone else has said & sell the 2WD & buy a 4WD, or 2) If you just HAVE to keep this one, don't even mess with trying to install the weak KJ IFS system. Put your time & money in to a SFA set up. Either way, you are going to be spending tons of money, so you may as well spend it right!