This may have already been said, but I have a habit for not reading each post completely - the 1992 RRC that you have access to for parts will not help you - I don't think LR went to 24 splines until 1993 and that was only on the LWB models??? (actually I'm not sure when the 100" wheelbase went to 24 spline, but I'm pretty sure it was 1993 or later). If it did have 24 splines, then thats a good option, cause its cheap....
The good news is that you already have the ABS hubs, so no need to swap that out. Personally, I would save up your money, buy upgraded aftermarket 24 splines AND some type of rear locker or limited slip or something at the same time - the spider gears/carrier in the LR diff (even the 24 splines) are pretty weak, like Paul said, you will then trash diffs - you might even do that before you snap a 10 spline shaft depending on how your luck runs.
Doing stuff a "little at a time" always ends up more expensive than just doing it right the first time. I have a 1992 Base model RRC - no ABS, I'm saving money, going to upgraded 24 splines and most likely a true-trac limited slip in the rear - nothing too serious, but I just don't want to worry about the rear end anymore, just get it over with - and I only run 31's!! Until then, I'm just easy on my 10 splines - I figure if I got to pay a guy to set up a LR stock diff to move to 24 splines, it might as well be a limited slip or locker - don't pay to have the rear end set up twice. I figure with a relatively bulletproof rear end and swapping to an LT230, I could always drive home, even if I trash the front diff/axles/CVs
Hope this helps - sorry, I was notorious for cutting corners, then having to re-do it again later, fortunately, I think I've learned my lesson, just do it right the first time, it hurts a little more, but not near as much as spending a bunch of money to only break something else and then having to start over again.
Steve
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2001 D2 -The Stevo-II 
1992 RRC-The Stevo-I 
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