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International Harvester folded their pickup line with the 1975 model year and shown here on the left is a 1975 pickup. For this year they renumbered them so instead of being the traditional 120, 1200 or 1210 for the 3/4 ton pickup it was a D-200.
As you might guess, overall these were not radically different from the models for the previous years. The same cab had been used since 1968 or '69. The grill and the hood line was changed a little. On the right is a 1973 model for comparison. Under the hood however they did make a major change for 1975. All of the 1975 models have a set back engine. The engine compartment would take an inline 6 engine, but when a v-8 was installed for years the engine was set forward and half the transmission was in the engine compartment. This made for a very oddly bent gear shift lever as the floor shift came up 'way forward' under the dashboard and was bent back oddly. Traditionally also, the oil sump for the engine was in front of the front axle.
However, on the 1975 model for reasons not to clear to this writer, the engine was jammed to the back of the engine compartment, and the engine modified to use a real oil sump. This meant that the oil pump and pan and dipstick are different. Instead of the traditional front end dipstick, the dipstick is back on the side reaching out around the outside of the manifold.
The exhaust manifolds are different also. Moving the engine back required a saddle mount engine motor mount because the front of the engine was not over the front frame member and the saddle ended up being right in the middle of the engine which conflicted with the traditional center exit exhaust manifolds, so this model had rear exit manifolds which you now can't get anywhere, because they are so rare.
The V-392 IH engine was the most common but some of these vehicles also appeared with a Rambler 400 engine in them. The 392 was really more engine that this pickup needed. Besides being 9 miles to the gallon, it would develop enough torque to 'power slip' the clutch if you just mashed the pedal to the metal when the engine was near its max-torque rpm. The other problem with this engine was oil leaks. The problem here seemed to be associated with excessive blowby which in turn was caused by the failure of the rings to seat. Apparently the block was so hard that unless you really drove it hard when it was new the rings just never would get around to seating.
Like most pickups, the pickup box was far too flimsy to survive very many years of rough road before it shook apart. The tool body was retrofitted on this model mostly in self defense because the pickup box just shook apart. Loggers drive on bad roads, and pickup boxes and bad roads just don't go together for very long.