In 1979, GM debuted its newly downsized personal luxury trio: The Cadillac Eldorado, the Buick Riviera, and the Oldsmobile Toronado. All three had been valued members of the General Motors fleet by that time, but in ’79, they all became front wheel drive.
It wasn’t always that way. The original Buick Riviera started out as its own model, albeit borrowing heavily from the full-sized Buicks, from inaugural 1963 through 1965. Then the Toronado appeared in 1966, with front wheel drive. The redesigned ’66 Riviera was on the same body, but retained rear wheel drive. Finally, in ’67 the front wheel drive Fleetwood Eldorado coupe came onto the scene.
From ’67 until 1976, all three E-coupes stayed this course: same body, but with the Olds and Cadillac front drive and the Riv rear wheel drive.