Why not just put the 4.3 in it and then straight axle the luv? I wouldn't mess with that S10/sonoma/blazer axles you would be much happier with toy axles or jeep axles. And a straight axle would be easier to put in your luv. I guess it just depends what you want out of it. I did a frame swap. And im really happy with it so far.
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"Project Rangeluv"-Dana 28/7.5 rear, TFI2.9V6 5spd, 86 Ranger frame swap, custom flatbed,Custom luv!
1989 ford bronco II "The Mountain Rig"
My build thread (
viewtopic.php?f=33&t=24076)