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First four-wheel-drives By: Dave Mowitz
Take a trip down memory lane with these photos of the four-wheel-drive tractor pioneers.

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Big Bud 747: The Big Bud 747 tractor was built in 1977 in Havre, Montana, by the Northern Manufacturing Company. The tractor was built to produce 760 horsepower using a 16-cylinder Detroit Diesel engine. The tractor measures 27 feet long, 20 feet wide, and 14 feet tall. The tires were specially made by United Tire Company of Canada and are 8 feet in diameter. When the 1,000-gallon fuel tank is full the tractor tips the scales at over 100,000 pounds.