 For 1975, Mercury discontinued the Monterey, consolidating its full-size range down to the Marquis.The same year, the Grand Marquis was introduced as a sub-model, becoming a distinct model range in 1983.Approximately 7,850,000 full-size Fords and Mercurys were sold over 1969–78; this makes it the second best selling Ford automobile platform after the Ford Model T.

The 351 Windsor and Cleveland V8s were added for 1971, the final year for the 390.