2 bolt starters and center housings were a carry over from the farmall M gas tractors. Diesel tractors used a 3 bolt housing but its different than the 3 bolt housing used on stage 2 SM gas and diesel. Starting with stage 2 the same housing was used for both tractors. That saved IH from producing 3 different housings because the late housing became the replacement for early tractors. A different starter drive housing was ordered when a replacement was used. Don't know why it took IH from 1941 to 53 to do that. Also as JN. pointed out IH was already working on the SMTA. Starter, hydraulics and controls except for pto and length of some parts are pretty much the same on a SMTA and a stage 2 SM. Maybe the above is some of the reasons, I can only guess.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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