Have you ever wondered what separates a true fan from a casual fan? There has to be some dedication, right? Some ability to go beyond just the basics. A casual football fan will watch the Super Bowl. A true football fan can tell you who coached the Green Bay Packers in 1975. That same level of passion goes into being a true fan of the automotive world. You have to know more than just the most popular makes and models. A true auto fan knows all of those gritty and fun details that go on behind the scenes and under the hood throughout a vehicle's history. If that's the kind of auto fan you are, then maybe you want to put your money where your motor is and try your hand at this quiz. It'll push you to the speed limit of your knowledge. T137 is the engineering code that which of these vehicles is still sometimes known by?