Type Four platform
| Type Four platform | |
|---|---|
|
|
| Overview | |
| Manufacturer |
Fiat Group Saab Automobile |
| Also called | Tipo Quattro Tipo 4 |
| Production | 1984–1998 |
| Body and chassis | |
| Class | Executive car platform |
| Layout | Front-engine, front-wheel drive / four-wheel drive |
| Vehicles |
Alfa Romeo 164 Fiat Croma Lancia Thema Saab 9000 |
| Dimensions | |
| Wheelbase | 2,660–2,670 mm (104.7–105.1 in) |
The Type Four chassis was a common front wheel drive platform used in the 1980s and 1990s for the Saab 9000, Fiat Croma, Lancia Thema and Alfa Romeo 164.
It emerged as an agreement between the four carmakers in October 1978 to reduce development costs on new top-of-the-range saloons, although it would be another six to nine years before the cars were launched. It was front-wheel drive, with optional four-wheel drive, and used a 4-wheel independent MacPherson strut suspension, except on the Saab.
The Saab and Lancia versions were the first cars to be launched in 1984, with the Fiat debuting a year later, and the line-up being completed in 1987 with the arrival of the Alfa Romeo.
The Fiat and Lancia looked much like the Saab, but the Alfa Romeo only shared the chassis. The wheelbase is 2.67 m (105 inches) on all models. The Peugeot 405 and Peugeot 605 shared no components with any of the Type Four cars, but looked very similar to the Alfa Romeo 164 as it was also styled by Pininfarina, although it was actually based on a Citroen XM platform. The Saab and Fiat were launched as five-door hatchbacks and the Alfa Romeo and Lancia sold as four-door saloons. Lancia added the only Type Four estate in 1986 and Saab eventually added a saloon version of the 9000 in 1988.
Because they were very similar, many parts can be exchanged between the four cars regardless of brand. For example, the doors from the Fiat Croma fit directly on the 9000. The windshield from the Croma can also be used on the 9000. Likewise the wing mirrors off both the 9000 and the Thema are almost identical (9000 has a pressed recess on the mirror casing, Thema is without recess) and should fit both cars with the doors being similar. Because its platform was shared closely with three other cars, the Saab 9000's ignition key was situated on the steering column instead of between the front seats. Alfa Romeo differs most from other cars, it has for example an exclusive front suspension and has some chassis modifications. The Saab has a beam axle rear suspension, rather than the independent MacPherson found in all the other models. The front of the Saab is radically different from the Italian siblings due to the much improved crash protection.
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Wikipedia