Manufacturers use test mules to develop future cars on the road without revealing production designs. Sometimes though, these mules are as cool—if not cooler—than the final product. Here are nine of our favorites.
The Sprint has the same design, features and equipment as the El Camino with some renamed. It was offered as "Standard" or "Custom". The inline six was only available on the "Standard". Like the Chevelle and El Camino, the GMC Sprint could be ordered with standard 3-speed Synchro-Mesh manual transmission or the optional four-speed Synchro-Mesh manual or Turbo Hydra-Matic three-speed automatic transmission . Luxury options, such as air conditioning, cruise control, power windows and locks, were also available at extra cost.
Introduced in October 1978, the VB Commodore development covered a period with the effects of the 1973 oil crisis still being felt. Hence, when Holden decided to replace the successful full-size HZ Kingswood with a new model line, they wanted the new car to be smaller and more fuel efficient. Originally, Holden looked at developing a new WA Kingswood, however, this project was later dismissed. With no replacement in development, Holden looked towards Opel for providing the foundations of the VB, basing it loosely on the four-cylinder Rekord E bodyshell with the front grafted on from the Opel Senator A, both constructed using GM's V-body platform. This change was necessitated to accommodate the larger Holden six- and eight-cylinder engines. Holden also adopted the name "Commodore" from Opel, which had been using the name since 1967. Opel went on to use Holden's Rekord-Senator hybrid as a foundation for its new generation Commodore C, slotting in between the two donor models.