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An alternative to an open differential is a limited-slip differential. A limited-slip diff allows some slippage to occur up to a certain point between the spin rates of the two wheels before it attempts to direct torque to the wheel with the greater traction by limiting the slip on the wheel with the least traction. This solution provides the driver better control of their truck, especially through quick turns. Limited slip diffs may use only gears to handle torque transfer or, more commonly, a set of clutch and friction plates. One notable truck that uses a limited slip differential is Ford's high performance SVT Lightning.

The last type is a locking differential. Locking diffs allow very little slippage to occur between two wheels. When one wheel starts to lose traction the gears lock together to minimize wheel spinning and ensure power is sent equally to both wheels at all times. Unless the axle itself starts to slip, and you don't have a center differential between the front and rear axles, locking differentials can get you out of most sticky off-road situations.

Locking differentials come in two flavors: mechanical and electronic.

Mechanical locking differentials typically engage when some RPM threshold is broken between two wheels. When slippage occurs, and relative wheel RPM dramatically changes, it centrifugally trips a flyweight in the locking mechanism, causing gears in the differential to engage and tying both wheel spin rates together. As soon as the wheels both have traction the locker disengages.

An electronic locking differential, or ELocker in Eatonese, engages electronically with the touch of a button when the driver determines a need for more traction. The button sends an electromagnetic signal to an armature, engaging a ball bearing ramp that pushes pins into the back side of the gear and locks the axle. When the signal is turned off, pressing the button again, the ball ramp slides back into place disengaging the locking pins. Think about twisting a dial to lock the axles together and you can picture an ELocker in operation.

Toyota has also offered its own version of an electric locking rear diff for the Tacoma pickup for several years now as optional factory equipment.

Now that you have had a backgrounder in differentials, it's time for the classified stuff. Consider the following for your eyes only.

We took a trip out to Eaton's restricted proving grounds to test drive the new ELocker first hand. Set out in Michigan's rural backcountry near the town of Marshall, the proving grounds condense every test and torture a differential might face in the real world into a heavily rutted, wooded and instrumented 640 acre lab facility. If Dante had been an off-roader, Eaton's proving ground would have been his inspiration for the 10th ring, the ring for traction control product manufacturers who sell underengineered differentials as OEM equipment.

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