Just a quick question about the locking differential. I'm just wondering can you activate the locking diff while turning or on the gas pedal? Because today when I was climbing up an icy hill, I thought I'd turn on the locking diff,I was still on the gas when I pulled the switch. For a second I saw a warning on my dashboard, but quickly went away before I had a chance to read it. Just wondering in what conditions you can lock the diff. I also hear that you couldn't activate it while turning at a certain degree?

 

The ELD disengages when you reach over 20 mph. If you have the auto 4 wheel drive feature that would be the situation to use it. This is from the manual:

Electronic locking differential (ELD) (if equipped)
The electronic locking differential (ELD) is a device housed in the rear axle which allows both rear wheels to turn at the same speed. The ELD can provide additional traction should the vehicle become stuck. The ELD is electronically activated by the driver and can be shifted on the fly within the ELD operating speed range. It is intended for use in mud, rocks, sand, or any off-road condition where maximum traction is needed. It is not intended for use on dry pavement.
The ELD is affected by the following conditions:
• The ELD will not engage if the vehicle speed is above 20 mph (30 km/h) in 4x2, 4x4 Auto, or 4x4 High modes.
• The ELD will not engage if the vehicle speed is above or 56 mph (90 km/h) in 4X4 Low.
• The ELD will not engage if the accelerator pedal is pressed beyond 50% during an engagement attempt
• In 4x2, 4x4 Auto, and 4x4 High modes, the ELD will automatically disengage at speeds above 25 mph (40 km/h) and will automatically reengage at speeds below 18 mph (30 km/h).
• In 4L (4X4 low), the ELD will automatically disengage at speeds above 62 mph (100 km/h) and will automatically reengage at speeds below 56 mph (90 km/h).
• The AdvanceTrac system has the ability to take over control of the ELD and disable it during driving maneuvers when necessary.
If the required conditions for ELD activation are not met when the switch is actuated, the instrument cluster will display the appropriate information guiding the driver through the proper ELD activation process.
Note: The ELD is designed for off-road use only and is not intended for use on dry pavement. Using the ELD on dry pavement will result in increased tire wear, noise and vibration.
Electronic locking differential (ELD) indicator lights
This light will be continuously displayed in the cluster when the ELD is active.
The indicator will turn off if the ELD automatically disengages because the ELD threshold speeds are exceeded and will turn back on when the ELD automatically reengages when the ELD threshold speeds are not exceeded.

 

They need to add to the manual

Note: The ELD can cause excessive tire wear if brake pedal is held and throttle is fully applied.

 

I am sure they will add that in the next manual revision.

 

They should. Being able to lock in 2wd just begs big smoky burnout. I have black marks in front of my house to prove it.

 

They will leave posi marks with both wheels without the ELD locked wont they?

 

It's an open diff when the locker is turned off. But offroad both wheels do really well at locking together with the ELD turned off.

 

I know its an open diff when unlocked. But the truck automatacaly drags the brakes on the wheel with the less traction to force power to the wheel with traction. Acting like a posi essentially

The truck will turn both tires over from a stop with the ELD dis engaged. Try doing that with a open rear end without this new ford traction system.