For the rear, i bet many would agree the Ford 8.8 is a great swap. They're found on 96+ Explorers. 31 spline, 5 on 4.5", width is about the same, disc brakes, monster tubes... in most cases you could be able to find one for around $400-500, maybe cheaper if you look.
For the front, you might consider staying with your D30. I believe if you have a 95 or newer, you get the D30 with the 297x ujoints. These are the same ujoints on a D44 and this is usually the first point of failure.
1995.5 Isuzu Rodeo - SAS'd and SOA'd, sitting on 36x12.50 TSLs, D44 front, 14bff rear, locked by OX and Detriot, suspensions by Jeep and Chevy, high steer conversion, 5.13 gearing and Teralow in the case. email@example.com - website
The only mandated change to the front that could be dictated by a rear axle swap is gear ratios. For example, I'm having a Dana 60 installed next Thursday, but the only change to the front end is that I'm having 4.56:1 gears installed in an otherwise stock Dana 30. Reason being is that my rig has 3.07 gears right now, but 3.07's don't exist for a D60 (not that I'd want 'em if they did... ). Hence, I am forced to regear the front axle to accommodate the rear.
The Dana 30 reverse-cut model that's standard on YJ's is a fairly decent axle from what I've seen, and '95 and later (I believe) use the same steering U-joints as it's big brother Dana 44. Get rid of the hokey vacuum disconnect, and the D30 is quite a rugged little axle for it's size. Cheers!
The Ford 8.8" axle seems to be popular, but not the best option. It still has C-clips, which means you still have to carry spare axle shafts. I'll probably go the D44/D60 route whaen I upgrade. I was pretty much set on the D44, but Nightclaws research has me leaning toward the D60 now. It seems there's only a couple hundred dollars difference between the two, at least at MIT.
91YJ Sahara, SOA, 4.88's, 35's, Locked