Posted 24 December 2008 - 12:17
Does this help? From Kit Car Magazine.
Henry
The first 1964 Ford GT prototypes were lovely but lethal. The body had no tail spoiler and the nose was bereft of a spoiler or special shaping that could have produced needed downforce. However, photos of the upcoming challenger had been flooding automotive magazines ever since the first mock-up was completed, so every car nut on the continent knew what it would look like. Fiberfab was a fledgling kit car manufacturer launching a small sports car based on VW running gear, and they figured the new Ford GT had styling that enthusiasts would crave. The Fiberfab Aztec came out in 1964 and, although not an exact replica, it mimicked the lines of the first Ford GT. The Aztec was a huge success by kit car standards, with hundreds, perhaps thousands, sold. They are seldom thought of as Ford GT replicas, since few today remember the first Ford GT prototypes before they were updated.
An original 427-powered Mk II (front) shows how much shorter it is than the "new" 2003 Ford GT.
When the Aztec began to fade in popularity, Fiberfab replaced it with an upgraded version, the Aztec II. This looked a little more Ford GT-like, with a tail spoiler and a longer nose. They followed with an all-new car called the Avenger. This wasn't a Ford GT replica, but was heavily influenced by it. The Avenger was sold in various versions based on VW or Corvair power, and there was even a V-8 model with the same body called the Valkyrie. Thousands of Avengers/Valkyries were sold in the 1970s.
Kellison built the first semi-accurate clone of the Ford GT in the mid-1960s. Called the GT40K, it wasn't exact but looked fairly close. Most were built to go on VW floorpans, but a few came with tube frames mounting V-8s bolted to Corvair transaxles. GT40Ks were built until the early 1970s. Very similar kits were sold at the same time by Sports Racing Equipment (as the Sebring Mk III) and the Scorpion Motor Company. Kellison, SRE, and SMC were all located in California.
The 2003 Ford GT kept the feel of the original, but added a modern aluminum chassis and supercharged engine.
The development of Ford GT replicas (and other mid-engine V-8 kits) was slowed by the lack of suitable transaxles. In the 1960s, the best box came from the Corvair, but it was difficult to mount and could only hold about 300 hp. Later, Porsche 911 and 930 gearboxes were modified so that they could be turned around, but the stock ratios weren't ideal for a V-8 engine. Also, having them modified for mid-engine use wasn't cheap. The Porsche 914 gearbox was already set up for mid-engine use but wasn't very strong. The other choice was the beefy ZF transaxle installed in Panteras. (The last original Ford GT Mk Is had used a different, sequential ZF gearbox.) In the 1980s, the Pantera boxes could be bought out of wrecked cars and were later put back into production. In the early 2000s, some GT kits used Audi transaxles, but there were durability problems. The Audi transaxles are seldom seen today. Many English kits used the Renault 30 transaxle, but parts for this unit were scarce in America. Today, the Porsche and ZF gearboxes are still available, as is an expensive replica of the Ford T-44 gearbox.