i'll momentarily ignore all the crap that has been posted and reply to the OP: i've heard that e-lockers tend to work extremely well at first, then they tend to wear out and act more like limitted slips after heavy use, but, that's just what i've read and i know some that have them and have had great luck with them... they wouldn't be as popular as they are if they sucked. and, they are a bit more pricey than a lunchbox locker, but the upside is you get selectable.
now, to respond to the rest of the crap.
242s came in late model xjs, they had 2H, 4H-full time, 4H, N, 4L. other grands (not as familiar with them) had full time all wheel drive and were never in only 2WD
it's not the jeep, it's the driver in terms of having a locked front in the snow. i have a no-slip in the rear and a tru trac in the front. so, essentially locked fr and rear, as far as the street is concerned. i have a 231, so no full time option for me. i too have never had a problem in any form of the street. in fact, i prefer it to open-open. it's more consistent. i was wary about having a locked front in the snow on the street, but i eventually got over it and it's been great. so... instead of everyone clogging this thread with selectable vs automatic, if you're going to post, post something that gets back to the OP...