New chassis details included a column gear shift, horns just behind the grille, battery under the right hand side of the hood, transverse muffler just behind the fuel tank, wheels by a different manufacturer, "Synchro-Flex" flywheel, hypoid rear axle and the deletion of the oil filter.

Chassis changes included: tube and fin radiator core; sea shell horns under the hood; 10mm spark plugs.

It retained most of its pre-war styling and rode on the long 136 in (3,500 mm) wheelbase and used a distinctive body not shared with other general Motors divisions.

Standard equipment included large wheel discs, fender skirts, hood, side and lower beltline moldings and stainless steel running boards.

Consideration was given to the deletion of the long wheelbase line in 1948, but competitive pressure from Packard in the luxury class market dictated the retention of the Series 75.

Minor revisions on the outside of the cars included a new background for the V-shaped hood emblem and Cadillac script, replacing block lettering, low on the fenders behind the front wheel opening.

To accommodate luxury-class buyers the long wheelbase Series 75 was carried over in 1949 without any basic changes except that a more conventional dashboard design appeared featuring a horizontal speedometer.

The grille wraparound panels were redesigned once again having broad chrome trim below each headlight with side scoop styling and gold-colored winged emblem mounted in the center.

A full length vertical air slot-style fender break molding was placed directly behind the rear gap of the back doors.

Identifying the Series 75 were bright metal moldings, just forward of the rear wheel openings, highlighted by seven horizontal wind splits.

This four-door hardtop with rear suicide doors was an ultra-luxury car that cost an astonishing $13,074 — twice the price of any other 1957 Eldorado and more than the Rolls-Royce Silver Cloud of the same year.

It featured a stainless steel roof, air suspension,[8] the first automatic "memory" power seats, a dual four-barrel V-8, low profile tires with thin white-walls, automatic trunk opener, Cruise Control, high pressure cooling system, polarized sun visors, Signal-Seeking twin speaker radio, electric antenna, automatic-release parking brake, electric door locks, dual heating system, silver magnetized glovebox, drink tumblers, cigarette and tissue dispensers, lipstick and cologne, ladies compact with powder puff, mirror and matching leather notebook, comb and mirror, Arpège atomizer with Lanvin perfume, automatic starter with restart function, Autronic Eye, drum-type electric clock, power windows, forged aluminum wheels and air conditioning.

Buyers of Broughams had a choice of 44 full leather interior and trim combinations and could select such items as Mouton, Karakul or lambskin carpeting.

1958 was the last year for the domestic production of the handbuilt Series 70 Eldorado Brougham at Cadillac's Detroit factory, as future manufacturing of the special bodies was transferred to Pininfarina of Turin, Italy.

The 1959 Cadillac incorporated totally new styling with a large tailfin, twin bullet taillamps, new jewel-like grille patterns and matching deck-lid beauty panels personified these cars.

The long wheelbase sedan and limousine had auxiliary jump seats, high-headroom formal six-window styling, broad ribbed edge beauty panels and trim generally similar to Series 6200 Cadillacs in other respects.

While the rest of the model line gained new rearward slanting A pillars and a less severely wrapped windshield the Series 75 continued with the greenhouse design introduced in 1959.

Sales of the commercial chassis earned an increase of 30 units, while limousine deliveries tapered slightly downward and the popularity of the nine-passenger sedan saw a considerable decline.

Standard equipment now included automatic level control; air conditioning; carpeted fold-down foot rests and 8.20 × 15 four ply 8PR blackwall tires.

Again marked by simple extra-long body rub moldings, a formal high-headroom look with doors cut into the roof and Fleetwood-type wreath and crest emblems, the nine-passenger models had the longest Cadillac production wheelbase, as well as power front ventiplanes, automatic level control, right-hand manually operated outside rearview mirrors, 8.20 × 15-8PR blackwall tires and automatic climate control air conditioning as standard equipment.

The V-shaped grille had an egg-crate style insert and was protected by massive vertical guards framing a rectangular license plate indentation.

A horizontal belt line molding ran from behind the front wheel housing, almost to the rear stopping where an elliptical bulge in the body came to a point and where thin rectangular side markers were placed above and below the chrome strip.

The rear roof could be custom finished in several different ways including triangular "coach" windows or vinyl covered "blind quarter" looks.

Trim included bright body underscores with rear extensions; horizontal thin belt moldings; Fleetwood front fender lettering and laurel wreath badges for the hood and deck lid.

Larger vertical rectangles housed the parking lamps between wide spaced headlamps which had square bezels but round lenses.

The Series 75 had a thin horizontal bodyside molding; front fender nameplates; full-length body underscores with rear extensions and Fleetwood-style wreath badge ornamentation.

Cadillac also offered Track Master, a computerized skid prevention system that automatically pumped the back brakes in an emergency situation to shorten stopping distance.

Interior choices were Medici crushed velour fabric in black or dark blue, or Magnan Knit in light gray.

In 1977, General Motors significantly downsized their full-sized cars in response to United States Federal CAFE standard legislation.

For 1981, the 368 was provided with a modulated displacement system designed by Eaton Corporation, controlled by a digital computer, which locked off intake and exhaust valves to two or four of the eight cylinders, thus running effectively as a V6 or V4 under light load conditions where in third gear, and over 35 mph (56 km/h).