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Doing what you described won't work. The sherman works by changing the engine rpm as it goes into the transmission (that's important). At the transmission it splits, going to the rear wheels and to the pto. So, if you put the Sherman in low range, the rpm going into the gearbox is lowered. This reduces vehicle speed in a given gear, *but* it also reduces the pto rpm the same percent. So you have to rev the engine up to get the pto rpm up where it belongs...bringing the vehicle speed up the exact same amount. The exact same thing happens in the overdrive position. The Sherman doesn't give up underdrive per se, it gives you increased power by bringing the engine rpms up into the peak power range at standard pto rpm. That's the original marketing claims of Sherman, was that it gave you increased power, something like 20% increase if I remember right. The Sherman was a strong transmission. It was designed precisely for increasing power, and is built to take it.
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