Late 70s early 80s Jeep wagoneer front axles are popular for the LUV/Isuzu. The diff is on the correct side to hook to the stock trans, and the width is close enough to work. I don't recall the best years to use though, but I do recall if you pick the right year you can get same 6 lug bolt pattern as the LUV rear and gears to match. The other plus is that they used a Dana 44 which is plenty strong for just about any motor in a LUV that is a daily driver. I think if I had the time/money I'd got for this in the front and use an Isuzu 12 bolt out of a 88-91 Isuzu Trooper for the rear.
I've also seen older mail Jeep axles used in the front, there were a few companies back before the factory 4x4 LUV came out that put those in as an aftermarket swap.
I'm not sure on the diff positioning on Toyota axles in the front, but that would be another place to look.
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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)
MEPR: Man, my 4x4 makes all other LUVs look good