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A limited slip differential has a pack of plates and friction discs behind the differential side gears to equalize the torque available to each rear wheel automatically. This type of differential still allows the axle shafts to rotate at different speeds when the vehicle is turning. The ELD uses an electric field coil and a dog clutch that locks the rear differential side gears mechanically on demand. This type of differential when locked will not allow for a difference in speed between the two axle shafts and is intended for temporary use on slippery or off road conditions.
 
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So, just what is an electronic locking axle? vs a limited slip?
I've got this on my F250, and it has helped my 2 wheel drive truck claw it's way up my driveway in light to medium snow. It's also helped on slippery boat ramps. My only complaint is that it doesn't always disengage cleanly, needing to roll forward or backwards in neutral to completely disengage. I'd buy it again, all things considered.
 
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