hi recessionone read your post you could have bad geardrive with drives the auto focus motors
can be fixed use and up grade to a d90 d7000 and use your d80 as a back up all the better cameras have the drive pin in them so you can auto focus in aftermarket lenses like tokina
tamron sigma and other manufactures also . some of the nikon cameras also have this driive pin
are d50 d70 d70s d80 d90 d7000 d200 d300 d300s d700 d600 d800 and some more yes a great feature to have hope i helped gjr
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