I spoke to a bloke at the Sydney Motor Show years ago named Eric Banes......a feller who looked to be in his early 70'S.....about the Ph 4 concept in the XA's . he said it was canned 'coz a motoring writer (can't remember where he worked, Syd herald or Wheels mag but his name was Evans) had a major dummy spit about young people killin themselves in super cars, and after some kind of government knee-jerk legislation, planned models with go fast packs were canned, so, according to Eric, the Ph 4 bits did go into LTD's Fairlanes, F100's etc, with most of the top loader gearboxes being re-geared for commercial vehicles, and most of the 9-inch diffs going to anything from special orders to commercials, and the GT sedans in the XA's were to be very limited, sort of co-inciding with Ford Australia's withdrawal from motor racing in Australia, and sort of with the last of the Monaro go-fast packs decline too. (but the rise of the Sandmans & Sundowners?)