Mike is way wrong in saying the step down is the most popular as in my 70 years I have never even seen one and I do have one in a 9N and one that Dad had put in a 2N as soon as they became avaible. In all that time I may have seen only a couple of combination units. And you can tell what unit it is by the type of shift lever it has on it. And on some models the splines on the shafts are different so they will not fit. It is still a valuable item tho. And the Sherman if it is a step down also steps down the pto speed, step up also increases the pto speed so you always run a sherman in direct drive for anything on the pto. The only thin a Sherman steep down is good for is pulling a ground driven transplanter where you measure travel time in feet instead of mile per houy. The steep up in 2nd over is ideal for a ground drive hay rake or something like that. The steep up in low is totally useless as that gives the same speed as normal second. And 3rd over is a good road speed and I have put many many miles in on the road in 3rd over. I wish I had a over-under in the Ford NAA or the Ferguson TO-30 that I had. Second under possibly would have been a good speed for a moldboard plow. To put a Sherman in a tractor that has not had it you have to drill a hole in the center housing.
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