I don't remember what year international started making 2+2's, but they were a new concept for IH and in many ways, like many of their products, ahead of their time. Some will argue this point, but in looking back and comparing the 2+2, to all of the other row crop tractors and knowing that they were a "row crop" tractor, made to go between rows, not a heavy tillage tractor. Things become clearer. The IH engineers, took the back half of an 86 series tractor and put a hinge in front of that then the engine, radiator and fuel tank, all sitting on a powered front axle from the pay-loader division. All of the tires are the same size, giving the tractor excellent traction and with the engine and fuel tank, on the front half of the tractor, it also had excellent weight distribution. They are the kind of tractor you either love or hate. They are different to drive than most other tractors, because you sit BEHIND the articulation, like a pay-loader. Most other articulated tractors have the articulation behind the operator. What's the difference? When you are watching behind you in a 2+2, you have no idea where the front end is, so it is easy to run that long nose into something, like a fence row. But, when looking forward, if the front wheels clear it, the back wheels will also. This makes it a great cultivating tractor, or anything that needs to go down rows and not run over crops. The one i have is the smallest, it's a 3388 with the DT436. They also made a 3588 and a 3788. Both had a DT466, but the 3788 had a different transmission and an intercooler and a couple more turns on the fuel screw. A few years later they updated them a little and renumbered them as the 6388, 6588 and 6788. Shortly before the IH demise, they really improved them. They were a far superior tractor, that really filled in most of the short-comings of the older models. They only made 19 of them and if you have one, you have a prize! Here are some pictures of mine.