Front Wheel Assist (FWA) is known as 4WD or unequal 4-wheel drive. These tractors range in size from 5 HP - 400 HP and are capable of delivering between 50-55% of the rated power at the drawbar. On a FWA tractor the front drive tires are smaller than the rear tires. Equal Four-Wheel Drive (4WD) tractors have all four tires in the same size and range in size from 35 HP - 600 HP. It is challenging to maneuver and often the size and expense makes these tractors not easy to use in realistic.
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