Limited Slips
A
Limited slip differential will aid traction. If one tire starts to slip a
Limited slip will apply more torque to the tire that has the best traction. The amount of torque that it applies to the tire with the best traction depends on the
bias ratio of the
Limited slip. The higher the bias ratio the more aggressive the
Limited slip is and the more torque the
Limited slip can deliver to the tire with the best traction. A
Limited slip with a bias ratio of 4:1 (also called a 60% locking factor) can deliver 4 times more torque to one tire than the other.
There are three types of
Limited slips:
Plate clutch Limited slip – these differentials have alternating friction plates. You can tune these
Limited slip differentials by changing the order and number of friction plates to get a very high or very low bias ratio.
Needs a special oil or oil additive for the clutch such as Amsoil Slip Lock.
Cone Clutch Limited slip – These differentials have a cone shaped clutch on each axle shaft that grips the differential to help send torque to the tire with the best traction. These
Limited slip differentials are not tunable. In many cases they are not even rebuildable. This is because the cone grips the differential case itself. When the case is worn the whole differential must be replace. Also
needs a special oil additive.
Gear type Limited slip – These
Limited slips are a much different design from other differentials. The specially designed gears bind as one tire spins. This type of
Limited slip
does not require a special additive in the oil.
Automatic Lockers
A locking differential can deliver 100% of the torque to one or both tires even if one tire is off the ground. A locker can unlock to allow some differential action going around turns.
Lockers provide excellent traction to keep the vehicle from getting stuck but they also have the poor directional stability. If you give it a little too much gas going around a turn you can fishtail and loose traction.
A locker can always keep you moving but you may not be moving the direction you want. This is not a big problem as long as you are careful when you drive on the street.
Selectable Lockers
A selectable locker (also called On-Demand locker) can be turned off or on. This is the best of both worlds. You can have an open differential for street use when you want control. Then when you are off-road and worried about getting stuck you can activate your locker and both tires on the axle will rotate in unison. Selectable lockers activate with different methods. Some use compressed air to lock the differential. Some are cable activated and the driver moves a small lever. Some selectable lockers are electrical and the driver presses a button to activate the locker.
Selectable lockers have two disadvantages:
1. They cost more
2. They are more involved to install. They may need an air compressor, air lines, cable or wiring.
This was from Dave's Post there is more information here:
http://www.jeep-cj.com/forums/f105/l...entials-12434/