A typical symptom of IRS.  Weak shocks and/or springs can cause this to
happen faster but you would probably get uneven wear (scalloping).  When you
say "outside edge" do you mean just one outside edge or both outside edges
of each tire which would indicate low air pressure.

My 86 has new rear shocks but a weak left spring and I get a little bit of
uneven wear on the left rear tire.

Randy Herd
86 GL Weekender
68 Kombi
98 Jeep Cherokee

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