Alright, <hopefully> reviving this thread a little bit.
So I was thinking before, that with the EV conversion, I'd want purely regen brakes. It works just fine for trains; a 4000 lb Jeep shouldn't be a problem. Then you can eliminate the weight and added complexity of the hydraulic brakes. In the US, I don't think it's strictly legal on newer stuff; not sure how it would work with the older stuff as legality goes. I suspect it's pretty gray area, and then on top of that the odds that anybody's going to explicitly look for that when they pull you over seem low.
As I thought about this more though, if I went with the plan of keeping the D20 and putting a 3-on-the-tree in, this would cause a couple of MASSIVE safety problems.
Number one, in two wheel drive, only the rear tires would have any braking power, which is totally backwards from what you would want, if you're choosing one end to not have any brakes. This is actually the less concerning of the two.
Number two, if anything went wrong, and you wound up in N in a panic situation, no matter how much brake you tried to give it, it wouldn't actually slow you down any, because the motor(s) wouldn't be tied to any of the wheels.
So you COULD put a Qtrac/full time case in it, and run direct drive (2-speed reduction gear maybe?), but at that point, you're totally wasting power and energy, continuing to run the U joints and the driveshafts and all that fun stuff, and because you'd need the front locked in all the time, it would be incredibly inefficient. Not that it's going to be efficient with the aerodynamics of a barn door anyway, but it wouldn't be a great design, AND you'd have to worry about battery space, and protecting them, with that driveline there. I see two alternatives.
Number one, you could do a full IFS/IRS, and with the SJ platform and nothing there to go off of, you could do some nice long control arms, and coil overs, giving yourself both the flex of an FSJ and the handling of a fully independent car. The real disadvantages there are that it'd be a lot of custom and expensive work, and it wouldn't have any FSJ parts underneath anymore, so if you needed something, most likely it would be custom and hard to come by.
Number two, Dana might let you order some of these for a FSJ, I dunno. You could probably build your own with a D44/AMC 20 if you got ambitious.
http://www.danaelectrified.com/Products ... gid-e-Axle
Issues there are obviously large quantities of unsprung weight, and eventually, from being moved around with the suspension moving, I suspect those power wires would get worn out. Also ground clearance may be an issue; it's hard to tell in their listing.
I wonder if Jeep wants to retrofit the nee Wagoneer S stuff into an older one...it would be more Jeep than any other FSJ! It would be an all Jeep powertrain, with an all Jeep body. VS. the AMC or GM engine (ok the Tornado is Jeep), GM or Chrysler transmission, any number of manufacturers' t case, and Dana axles...