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What is a transfer case? 4x4 fundamentals made simple

What makes a 4X4 a 4X4 - all your transfer case questions answered in one place.
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Kenworth Transfer Case PTO Option on All-Wheel Drive Medium-Duty Trucks

Kenworth's all-wheel drive Kenworth T270 Class 6 and T370 Class 7 models now can be factory-ordered with a Fabco power take-off option (PTO) on the two-speed transfer case. Ad Loading... "Kenworth is ...