All of the new or improved features introduced for the 1990 deVilles were also found on the Fleetwood Cadillacs. The elite cloth used for the 1989 Fleetwood seats was replaced by a new "Ardmore" material. The Fleetwood's standard aluminum lace wheels different slightly from the deVille's by having a silver background for the center cap and a chrome wreath in association with a crest in traditional Cadillac colors. Wire wheel discs were optional.
Cadillac's depiction of the 1990 Fleetwood Sixty Special was of a car "for those buyers who seek luxury with power." Added to the Fleetwood's list of 1990 features were a number of items appropriate to the Sixty Special's status. Three new exterior colors, slate gray, medium slate gray and dark slate gray, were available for the Sixty Special. A total of 11 colors were offered. A new ultrasoft leather slate gray color, for a total of three, was also available.
| Model | Model Number | Style Number | Body Type | Factory Price | Shipping Weight | Production Total |
| Fleetwood | 6C | B47 | 2-door Coupe | $32,400 | 3538 lb | 17,569 |
| Fleetwood | 6C | B69 | 4-door Sedan | $32,980 | 3618 lb | 22,889 |
| Fleetwood Sixty Special | 6C | S69 | 4-door Sedan | $36,980 | 3657 lb | 1824 |
| Feature | Fleetwood coupe | Fleetwood sedan & Sixty special |
| Wheelbase | 110.8 in. | 113.8 in. |
| Overall Length | 202.7 in. | 205.6 in. |
| Height | 54.9 in. | 55.2 in. |
| Width | 71.7 in. | 71.7 in. |
| Front Tread | 60.3 in. | 60.3 in. |
| Rear Tread | 59.8 in. | 59.8 in. |
| Standard Tires | Michelin P205/70R15 | P205/70R15 |
| Type | 90-degree, overhead valve, V-8, aluminum block and cast iron cylinder liners, cast iron cylinder heads |
| Displacement | 273 cu. in. (4.5 liters) |
| Bore & Stroke | 3.62 in. x 3.31 in. |
| Compression ratio | 9.5:1 |
| Brake horsepower | 180 @ 4300 rpm |
| Torque | 240 lb.-ft. @ 3000 rpm |
| Main Bearings | Five |
| Valve lifters | Roller hydraulic |
| Fuel supply | Sequential port fuel injection |
| Transmission | THM 440-T4 automatic four-speed (includes overdrive and viscous converter clutch) |
| Steering | Power-assisted rack and pinion |
| Steering Ratio | 18.6:1 |
| Front suspension | Independent MacPherson strut with coil springs, strut-type shock absorbers and stabilizer bar |
| Rear suspension | Fully independent with coil springs. Automatic level control and strut type superlift shock absorbers |
| Brakes | Power assisted front disc and rear drum with optional Teves ABS |
| Body construction | integral body-frame |
| Fuel tank | 18.0 gal. |
1989