What's causing a not-quite-even wear on the inner fourth of the width
of a front tire? I noticed this recently on my 82 and have replaced
ball joints, steering rack, and innner and outer tie rods to get rid
of it and other steering peculiarities.

Now I am noticing the same wear on one side of my 90. Everything on
that side looks good (as compared to my 82, which had zerk fittings
and torn rubber and lots of obvious slop) so I don't want to replace
it all.

What should I suspect?

Thanks,

Jim