Lot of times the high speed road gear comes up in the IH tractors. If you look at a cross section of the transmission you will readily see how this comes about. The only way to change that road gear seed is to put the drive pinion down on the lower shaft. Being on the top shaft, direct drive is engine speed on pinion. They stayed with this all the way through the 86 series tractors. Then take a look at a A or B or C and you will note the pinion is on lower shaft. All you have to do to change highest gear is to alter the number of teeth on the transmission gear. Me, being an IH mechanic and really the only tractor I feel qualified to intelligently make judgement on, always felt they needed to change that and was disappointed when they made a whole new transmission and final drive with the 706 on up and still stuck to that basic design. Now the 50 series used a three shaft transmission so they could do a whole lot of speed changing in relation to engine speed. Ever notice how a late model 1066 for instance, would not pull any bigger load than an earlier model. It just pulled it faster. Upped the rpm's of engine, same gear ratio's, increased horse power so more work done but no more pull power.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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