Traction Control & Differential Behavior
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Logistics Pro
Joined: Sep 2002
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From: Central KY
Traction Control & Differential Behavior
The owners manual is a little vague. It says that when you switch to 4-low the traction control system is shut off by default. When you switch back to 2-high it is enabled again. But what about 4-high? If you switch to 4-high do you still have the same traction control?
I guess my next question is, does the traction control on these trucks act as a limited slip differential? On my prior trucks (mostly Jeep and Ram pickups) they used the traction control system as what they called a Brake Lock Differential. Basically, the rear diff was mechanically open. But the PCM would cycle the brakes as needed to keep traction going to the side of the axle that needed it, basically resulting in the same operation that a mechanical limited slip differential would provide. Do Ford Super Duty trucks act like that?
I guess my next question is, does the traction control on these trucks act as a limited slip differential? On my prior trucks (mostly Jeep and Ram pickups) they used the traction control system as what they called a Brake Lock Differential. Basically, the rear diff was mechanically open. But the PCM would cycle the brakes as needed to keep traction going to the side of the axle that needed it, basically resulting in the same operation that a mechanical limited slip differential would provide. Do Ford Super Duty trucks act like that?
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
The traction control takes out throttle when active. It is annoying, especially when you are trying to get across an intersection.
I seem to recall the TC light blinking when I was on snow and in 4H, but I could be mistaken. Maybe someone has better information.
I seem to recall the TC light blinking when I was on snow and in 4H, but I could be mistaken. Maybe someone has better information.
Laughing Gas
Joined: Dec 2021
Posts: 1,089
Likes: 343
From: PG, BC, Canada
In my experience I have never noticed the brakes coming on to put power onto the other side when wheel slippage acurred to act like a limited slip diff... Throttle input reduction is all I felt in 2H, 4H...
Mountain Pass
Joined: May 2007
Posts: 204
Likes: 61
From: Baja or Canada
My 2013 f150 used the brakes for traction control and it worked well. I also had the option to lock my diff when needed. Made the same sound as hill decent control, abs pump pulsing the appropriate brake to transfer power from one side to the other.
My f450 has no locker, the traction control is ineffective...and by the time the limited slip kicks in there is a hole dug a hole in my gravel driveway.
Its one one of my only complaints, everything else is as expected.
My f450 has no locker, the traction control is ineffective...and by the time the limited slip kicks in there is a hole dug a hole in my gravel driveway.
Its one one of my only complaints, everything else is as expected.
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