The 75 was introduced in May 1985 to replace the Giulietta (with which it shared many components), and was named to celebrate Alfa's 75th year of production. The body, designed by head of Alfa Romeo Centro Stile Ermanno Cressoni, was styled in a striking wedge shape, tapering at the front with square headlights and a matching grille (similar features were applied to the Cressoni-designed 33).
At the 1986 Turin Auto Salon, a prototype 75 estate was to be seen, an attractive forerunner of the later 156 Sportwagon. This version was, however, nixed after Fiat took control of Alfa Romeo. The car, dubbed the 75 Turbo Wagon, was made by Italian coachbuilder Rayton Fissore using a 75 Turbo as the basis.Two estate versions were to be found at the later 1987 Geneva Motor Show; one was this Turbo Wagon and the other was a 2.0 litre version named the Sportwagon.
The 75 featured some unusual technical features, most notably the fact that it was almost perfectly balanced from front to rear.This was achieved by using Transaxle schema - mounting the standard five-speed gearbox in the rear connected to the rear differential (rear-wheel drive). The front suspension was a torsion bar and shock absorber combination and the rear an expensive De Dion tube assembled with shock absorbers; these designs were intended to optimize the car's handling; moreover the rear brake discs were fitted at the centre of the rear axle, near the gearbox-differential group. The engine crankshaft was bolted directly to the two-segment driveshaft which ran the length of the underside from the engine block to the gearbox, and rotated at the speed of the engine. The shaft segments were joined with elastomeric 'doughnuts' to prevent vibration and engine/gearbox damage. The 2.0 L Twin Spark and the 3.0 Litre V6 were equipped with limited slip differential.