Doug, Horsepower is horsepower. HP = torque x rpm. The reason tractors have high torque for a given horsepower is that they produce their rated horsepower at low rpm. Once it gets to the rear wheels, the engine torque is irrelevant because gear reduction has made the torque at the axle identical for the high rpm/low torque engine as for the low rpm/high torque engine.
The big reason your farm tractor will out-pull a garden tractor is weight. Garden tractors are never rated at the drawbar because they can't get much power to the drawbar. A 20 hp garden tractor would be lucky to get 10 hp to the drawbar. Another thing is that tractor engines tend to have a nice, flat torque curve so you don't have to downshift when the going gets tough and the engine lugs down. But as long as you can keep a fast engine running at rated rpm it can do just as much work as a slower engine.
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Today's Featured Article - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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