LOCKED DIFFERENTIAL TORQUE DISTRIBUTION
WHEN you engage a locker, it effectively removes the differential gearing action from the diff. So now you’ve reverted back to a solid axle between the wheels, and it doesn’t matter if one wheel is on terra firma and the other is 50cm in the air, both wheels will turn at the same rate.
To explain how a locked diff can vary the amount of torque to each wheel, we’ll have to use maths. Let me introduce you to the standard friction equation:
F_r = is the resistive force of friction µ = Friction co-efficient for the tyre against the terrain you’re travelling across. N = Normal force (in Newton-metres), which is the weight of the car pushing the tyre down on the terrain.
Let’s look at a scenario where one tyre is on mud and the other is on a road surface. Both of the tyres are exerting a force of 1000N.
Adding both together you get a total resistive force of friction 1300N, which means 77 per cent of the torque is delivered by the road-side tyre and 23 per cent by the mud-side tyre. Road µ = 1 Mud µ = 0.3 Mud F_r=µn F_r=0.3 x 1000 F_r=300 Road F_r=µn F_r=1 x 1000 F_r=1000
A locked front diff will send drive to both front wheels in this situation.
TJ Jeep Wrangler getting a Harrop Eaton Elocker.