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4k tranny fluids

Hi all,
  I've been trying to follow the transmission fluid thread, but I seem
to have gotten lost... So, I'm asking for advice on what type of fluid
to use in my front, center and rear diffs. Anyone had success with
particular brands? The owners manual suggests SAE 80 or W-90 for the
front and center, and SAE 90 for the rear, although it also goes on to
say the doesn't need to be changed... hmmmm

What are the pros/cons to going to different weights in these
applications? Keep in mind this is a 150k+ miles car...

87 4kcsq shifting
86 4kcsq shiftless (probably because the trannies out...)