Alphabet Soup: 4×4 vs 4WD vs AWD Where’s the Differential? | The Truth About Cars: "Let’s set the way-back-machine to 1970. Trucks and “Jeeps” had 4WD aka 4×4 systems. The system had to be engaged manually once you were on a loose surface because they “locked” the inputs of the front and rear differentials together making turning difficult on high traction surfaces. Engaging AWD on pavement could result in damage to the systems, or at the very least strange road manners. These systems were found on vehicles that would otherwise be RWD like trucks and truck-based “things"
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