Although the incorporation of an automatic transmission, and U.S. emissions compliance, indicate it may have been designed for the American market, no version of the 400 series was ever officially imported to the USA. Despite this, many have been brought to America as gray imports, where the car enjoyed a limited popularity with movie stars, such as Sammy Davis Jr.
400 (Automatic) & 400 GT
The 400 Automatic or 400A used the General Motors Turbo-Hydramatic THM400 automatic transmission, whilst the 400 GT used a 5-speed all synchromesh transmission. This was the first Ferrari to have an automatic transmission.
The engine, based on the Daytona's 4,390 cc (4.39 L; 268 cu in), was a 4,823 cc (4.823 L; 294.3 cu in) V12 producing 340 PS (250 kW); front mounted and driving the rear wheels, the traditional GT car layout allowed Ferrari to fit four seats into the stylish coupé. 0-60 mph was 7.1 seconds.
400i & 400i GT
The carburetors on the 400 were replaced with Bosch K-Jetronic fuel injection for 1979. As in the smaller 308i, power was down substantially, to 310 PS (228 kW), but emissions were much improved.
412 & 412 GT
The 400 was improved for 1985 with an increase in displacement to 4,943 cc (4.943 L; 301.6 cu in) and a restoration of the original car's 340 PS (250 kW). ABS was offered for the first time on a Ferrari; the manual and automatic transmissions were both retained.
Production was stopped in 1989 with only the mid-engined Mondial offering 2+2 seating. The classic front-engine layout returned in 1992 with the 456.