Mechanically, the Eldorado benefited from Cadillacs traditional engineering excellence, with a 429 cubic inch V8 engine rated at 340hp and a massive 480lb ft of torque, teamed with the excellent Turbo Hydra Matic automatic transmission that first appeared in 1964. Noise, vibration and harshness were reduced greatly as well, thanks to a newly patented ultra quiet exhaust system as well as the improved box perimeter frame, four link rear suspension and revised engine placement.