AFAIK, Toyota moved from solid spacers in the earlier trucks to crush sleeves. If the 84 had solid spacers, then it was real close to the changeover point to crush sleeves. IIRC my 87 diffs had crush sleeves and I know for a fact that the FJ62 and FJ/FZJ80 9.5" diffs had crush sleeves.
Crush sleeves are much faster to use in set up at a factory, hence the switch.
Crush sleeves are much faster to use in set up at a factory, hence the switch.