1984 Eldorado
For the first time since the famed '76 Eldorado ragtop, Cadillac offered a convertible: the new and posh Biarritz. Its rear side windows raised and lowered automatically with the power top, and it contained a glass back window. Convertible bodies came in three colors: Cotillion White, Hatteras Blue, and Autumn Maple Firemist. Each had a white diamond-grain vinyl top, glass rear window, and color-coordinated headliner. Reinforced frame rails and crossmember braces and a bolstered body structure added the necessary strength and rigidity.
Convertibles had the following:
1984 Eldorado
The revived Biarritz convertible carried a hefty opening price tag: $31,286. That was nearly triple the cost of a '76 Eldorado ragtop when it was new.
Eldorado coupes started at a more modest $20,342. Eldorado's grille this year was vertically accented with a bright Cadillac script nameplate in the lower left corner. Rectangular headlamps sat above clear park/signal lamps. Appearance changes included the following: new car-colored bodyside moldings, new low-gloss black door trim bezels, instrument panel bezels, and air conditioning outlets. Base Eldorados had a new leather seat trim design. Other additions:
The coupes had a cabriolet vinyl top with glass rear window, brushed stainless steel roof cover, and opera lamps. Extended-range rear speakers became standard, except on the Delco/Bose sound system.
1984 Eldorado
The standard 4.1-liter V-8 engine added a new exhaust system, while the Oldsmobile diesel was not offered in convertibles (or in California). The Touring Coupe was again available, with a distinctive "Eldorado Touring Coupe" cloisonne hood surface and sail panel ornaments. Also included:
Touring Coupes came only in Sable Black or Sonora Saddle Firemist.
| Model | Series Number | Body/Style Number | Body Type | Seating | Factory Price | Shipping Weight | Production Total |
| Eldorado (V-8) | 6E | L57 | 2-dr Coupe | 6 P | $20,342 | 3748 lb | 74,506 |
| Eldorado (V-8) | 6E | L67 | 2-dr Convertible | 6 P | $31,286 | N/A | 3300 |
| Feature | Basic Gas Engine | Optional Diesel Engine |
| Type | 90-degree, overhead-valve V-8. Iron/aluminum alloy block; cast iron head. | 90-degree, overhead valve V-8. Cast iron block and head. |
| Displacement | 249 cu. in. (4.1 liters) | 350 cu. in. (5.7 liters) |
| Bore & stroke | 3.47 x 3.31 in. | 4.057 x 3.385 in. |
| Compression ratio | 8.5:1 | 22.5:1 |
| Brake horsepower | 135 at 4400 R.P.M. | 105 at 3200 R.P.M. |
| Torque | 200 lbs.-ft. at 2200 R.P.M. | 200 lbs.-ft. at 1600 R.P.M. |
| Main bearings | Five | Five |
| Valve lifters | Hydraulic | Hydraulic |
| Fuel supply | Digital fuel injection | Fuel Injection |
| Manufacturer | Cadillac HT-4100 | Oldsmobile |
| VIN Code | 8 | N |
1984 Eldorado
| Wheelbase | 114.0 in. |
| Overall length | 205.4 in. |
| Height | 54.3 in. |
| Width | 70.6 in. |
| Front Tread | 59.3 in. |
| Rear Tread | 60.6 in. |
| Standard Tires | P205/75R15 SBR wide WSW |
| Transmission | Four-speed overdrive automatic (THM325-4L |
| Ratios | (1st) 2.74:1; (2nd) 1.57:1; (3rd) 1.00:1; (4th) 0.667:1; (Rev) 2.07:1. |
| Standard final drive ratio | 3.15:1 except diesel, 2.93:1 |
| Steering | recirculating ball; power assist |
| Front suspension | torsion bar and link stabilizer bar |
| Rear suspension | independent trailing arm, coil springs, electronic level control |
| Brakes | four-wheel disc |
| Fuel tank | 20.3 gal. exc. 22.8 w/diesel |
1983