8.5 rear end

Ford 8 inch - looks like a mini nine inch - found in early seventies Maverick
Mustang, Cougar, and later seventies Granada / Monarch. V-8 models should have had five lugs with a 5 x 4.5 bolt pattern. Leaf sprung.

Ford 8.8 inch - used in 79 - 04 Fox body (85? up V-8 applications,, 79-11 LTD/ Crown Victoria/Mercury Marquis and trucks - phasing in around 1980. Four link and leaf sprung. 79-11 LTD / Marquis used 5 x 4.5 pattern, 80-97 trucks used 5 x 5.25 pattern.