The difference is a little more than that. The aft cabin bulkhead is one station further aft on the as-built Cherokee 160 (1961-67), with a full-size baggage compartment and aft bench seat. It's identical to the interior of the contemporary Cherokee 180. In the Cherokee 140 (1964-77) the optional snap-in rear seats are smaller, less supportive and mounted a bit further forward than the 150/160/180's permanent bench seat, giving the 140 less rear-seat leg room. Some 140s have the molded plastic rear bulkhead (an option beginning with the 1969 Cherokee 140B) that provides a modest cargo area behind the rear seats and a small hat shelf, but getting to it is awkward with no baggage door. Other 140s have a flat aft cabin bulkhead with zero room behind the rear seats.
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Above: Early Cherokee 140 "2+2 Cruiser" cabin.
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Above: My '77 Cherokee 140, decked out ready to haul newlyweds to their car waiting at an airport a few miles away, to avoid rowdy well-wishers. It was a tight squeeze getting the bride and her wedding gown into that back seat!
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Above: 1961-67 Cherokee 150/160/180 cabin.