All 2 gen 4Runners have a 7.5" in the front and a 8" in the back. If you really want toyo diff info try:
http://home.4x4wire.com/erik/diffs/
So far all I found about these diffs the hard way is exactly what is mentioned on his site. Looks to me he knows his stuff. 
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'90 4R
2JZ-GE swap, headers, turbo and intercooler
FR and RR LC axles
coils and discs all around
AllPro parking brake
305/70 R16 Yokohama MT
4.88 gears
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