Sorry to thread jack, but don't they come out pretty close in $$?
needed for 85':
IFS box, mounted, frame strengthened in that area,
possibly upgrade stock front hanger, springs, x-over steering, ifs calipers and
landcruiser rotors etc..
needed for 86:
solid axle, oil pan, SAS kit, x-over,steering, etc...
They are pretty close in my opinion, but that really depends on how you get your parts. just my .02
I think that for the v6 trucks, there is a difference since the t-cases cost more.