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Re: 91 4runner 4 wheel problem
It sounds like the front differential is going out. I would suspect a galled bearing or the bearings in the differential are going out.Hope this helps.
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If you are in 4WD, and not on a slippery surface, the tires may be having an effect called "scrubbing" where the tire on the outside of the turn is not rotating at the same rpms as the tire on the inside of the curve. I have noticed this on my jeep wrangler in 4wd.
Using 4wd on dry or non-slippery surfaces can cause this problem, and also will cause excessive tire wear.
Try the same manuever on a gravel road or a ice patch (it's been in 90s here in Texas, so good luck on that one) and see if it is improved.
Also, would probably expect a little more effort to steer when in 4wd because the universal joints or CV joints are not in perfect alignment during a turn.
Check that your front right brake caliper isn't dragging: coast to a stop, and check if it is hotter than the left.
check for even tire pressure and tread wear on each tire.
check axle alignment by measuring distance between front and back tires on each side, they should match.
if none of these fixes it you may have a partially seized bearing on your front differential