There was also a GT/J model, which was a less expensive version of the 1900GT sold only in Europe. Standard transmission was a manual 4-speed. A three-speed automatic was available with the 1.9 Ltr engine. The model run of the Opel GT was from 1968 to 1973. The Opel GT used a steel unibody and a conventional front-engined, rear-wheel drive layout. The Cam-In-Head (CIH) engine was mounted far back in the chassis to improve weight distribution. Front suspension consisted of double A-arms and a transverse leaf spring. A live axle and coil springs were used in the rear. The power-assisted braking system used discs in the front, drums in the rear. Steering was unassisted.
One unusual feature of the Opel GT was the operation of the pop-up headlights. They were manually operated, by way of a large lever along the center console next to the shifter. Unlike most pop-up headlights, they both rotated in the same direction (counterclockwise from inside the car) about a longitudinal axis. One standard joke about GT owners was that you can easily spot them due to the heavy muscles on their right arm built up by using the lever to pop up the headlights.
The Opel GT was a fastback, that had neither an externally accessible trunk nor a conventional hatchback. There was a parcel shelf behind the seats that could only be accessed through the main doors. Behind the parcel shelf was a fold-up panel that concealed a spare tire and jack. The interior of the Opel GT was surprisingly large for a car its size, owing to its original design process (exterior metal was sculpted around an interior model). Headroom and legroom were sufficient for those over 6 feet (1.83 meters) tall. During 1968 to 1973, a total of 103,463 cars were sold.
The most collectible GTs are probably the first few hundred cars hand-assembled in 1968 and the 1968-1969 models with the 1.1 Ltr engine, which totaled out at 3,573 cars. 10,760 of the later cars were the cheaper model (GT/J) which lacked nearly all chrome parts and less standard features. In some markets, items like a limited slip differential, front and rear anti-sway bars, heated rear window and engine bay light were standard, although most cars were shipped without them. The Opel GT can be seen in reruns of some episodes of the last season of Get Smart. Agent Maxwell Smart drove a GT in several episodes, with the car featuring prominently in the opening credits.