For 1985, Cadillac introduced a brand-new front-wheel drive platform for DeVille and Fleetwood. This car featured two "firsts"; it had the first transverse mounted V8 ever (the HT4100) and it was the first car to have a high mounted rear stop-lamp that was federally mandated starting in the 1986 model year. The rear wheel drive 1985 Cadillac Fleetwood Brougham continued on nearly unchanged from the 1984 model. 1985 was the final model year for the Fleetwood Brougham coupe. In 1986, the HT-4100 V8 was replaced with an Oldsmobile-sourced 307 cubic inch (5.0 L) V8 in the Fleetwood Brougham.