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Inner seals are what you should be concerned with the most. They are cheap and easy to replace once the axles are out, so I would replace them (If you decide not to replace them, don't let the axles rest on the seals that are currently installed when you pull the axles out a bit. This will deform the seal. Pull the axles out completely until the third is re-installed).
Take a look at the outer seals to ensure they look good (what you can see of them, anyways.) You would have to press off the bearings to replace the outers, and the critical ones are the inners to keep the diff fluid from leaking out.
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2002 4Runner, Auto-A340F, 3.4L, 4.30 Gears
TJM T15 Front Bumper & Warn M8000, 4xInnovation sliders, Sonoran Steel 1.2 Lift, Toytec LCA Skids, Tundra Brake Upgrade (231mm), Extended rear diff breather, Deckplate Mod, Andymod, Dual batt setup with Optima blue top aux battery, Hardwired 1000W inverter, Aux fuse box, Full time power to 12V plugs, Yaesu FT7800R Radio, "4-air" system for airing up/down tires.
2004 Camry LE - stock (and will stay that way)
1993 4Runner has been sold
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