There is no such thing as "torque power". Power is defined as the product of torque times angular velocity. In other words, horsepower equals torque in ft-lbs times rpm divided by the constant 5252.
Now, if two engines produce the same horsepower at different rpms, the one turning the slower rpm must necessarily produce more torque. But all other things being equal, each is capable of doing the same amount of work in the same amount of time. Power is simply the rate of work being done. So if it takes 50 horsepower to pull an implement at four miles per hour, in theory it doesn't matter if the engine produces 50 horsepower at 1000 rpm or 3000 rpm.
Now there are other things that come to play: Some engines have a flatter torque curve than others, which means gearing is not as critical and it's not necessary to downshift under certain conditions. In the case of the 961, tractor weight is a factor as it's a fairly light tractor for its horsepower. But there's no such thing as torque power.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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