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Originally Posted by Octane
You really cant have a fully locked diff on dry pavement because when cornering the inside tire needs to be able to turn faster than the outside tire.
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This goes for the rear as well, you can be locked but you'll eat up your tires really quick, that's why selectable lockers are great. Also the reason you shouldn't turn in 4wd with a part-time system is because the front and rear drive shafts are tied together with no center differential to account for the difference in speeds between them. When you turn the front wheels your front and rear tires also move at different speeds, if there isn't slipping at one of the tires you will create binding in the driveline, which is not good for anything. A 4wd system with center diff refered to as a full time sytem uses clutch plates that when a certain amount of torque is reached slip, allowing for different rotational speeds between the front and rear diveshafts. This is why a full time system can be used on dry pavement.
