4 high with auto lock on
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New User
Joined: May 2020
Posts: 22
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4 high with auto lock on
I am new to the whole manual locking and auto locking deal of your front wheels.
we had snow the other day so I threw it into 4h and pulled out on the **** to lock in the front. The symbol came up on my dash but anytime I went over 25mph it went away. The 4h stayed lit up the entire time though.
is this normal or do I need to take it into the shop?
my truck is a 18 f350 6.7l crew cab with 30k miles if that makes any difference.
thanks for the help and guidance
we had snow the other day so I threw it into 4h and pulled out on the **** to lock in the front. The symbol came up on my dash but anytime I went over 25mph it went away. The 4h stayed lit up the entire time though.
is this normal or do I need to take it into the shop?
my truck is a 18 f350 6.7l crew cab with 30k miles if that makes any difference.
thanks for the help and guidance
Laughing Gas
Joined: Oct 2017
Posts: 787
Likes: 72
From: Lansing MI
The above is 100% spot on. Pulling the **** away from the dash activates the electronic locker on the rear diff. This locks the rear wheels together. As they cannot spin at different speeds (The outside tire must rotate faster to make a turn as it takes a longer track), it is very hard of the system to make turns with this engaged, thus it should only be used in a straight line. This feature can be used in 2H, 4H or 4L, and is designed automatically turn disengage at 25MPH as you have seen.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,648
Likes: 694
The front is locked in (auto hubs locked in) when the switch is rotated to either 4H or 4L. Pulling out the switch locks the rear differential. A totally different thing. Please read the Owner's Manual on the proper operation of both features. As a newbie you need to understand how the systems work rather then just taking a stab at it.
Senior User
Joined: Jan 2021
Posts: 426
Likes: 92
You have your answer from the above post.
When I would use the rear locker is on a hill that was snow covered to get up it when I had to stop at the bottom. Even with 4wd my older F150 had issues until I locked it in.
If you are sitting there spinning in 4wd and can go straight then engage it to get you moving, as soon as you can disengage it.
When I would use the rear locker is on a hill that was snow covered to get up it when I had to stop at the bottom. Even with 4wd my older F150 had issues until I locked it in.
If you are sitting there spinning in 4wd and can go straight then engage it to get you moving, as soon as you can disengage it.
Laughing Gas
Joined: Jul 2020
Posts: 975
Likes: 458
Driving on slippery roads with the elocker on is extremely dangerous and could cause loss of control.
It will not let you steer your truck away from other cars or bridge pillars.
It will not let you steer your truck away from other cars or bridge pillars.
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Tuned
Joined: Nov 2019
Posts: 290
Likes: 19
From: NE Washington
Just the right amount of added traction on a wet boat ramp, as well.
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Mountain Pass
Joined: Sep 2020
Posts: 135
Likes: 6
From: N. NJ
One thing I've been trying to figure out is if the Electronic Locking Rear Axle is limited slip when not locked. Anyone know if there's any mechanical LSD as well? Or is 'slip' just managed by the Traction Control System when not locked?
Laughing Gas
Joined: Dec 2019
Posts: 863
Likes: 35
From: MA
No Limited slip
Hotshot
Joined: Jun 2003
Posts: 12,341
Likes: 4,366
From: SW VA
Yes, it can cause the rear end to kick out if you are not used to it, but to say it won't let you steer is quite the tall tale.
There's a few intersections on my way to work where I engage the locker if it's wet (turning right on red). Otherwise, my truck will just spin the inside tire, then the truck will do it's stupid traction control crap....meanwhile, I'm a sitting duck with traffic coming up on me at 50mph.
I just kill ABS/TC system, engage locker, and hammer down! (I have my locker on an upfitter switch, so it doesn't abide by the 25mph rule. I also have my ABS/TC circuit on an upfitter so I can disengage it)
Tuned
Joined: Oct 2020
Posts: 449
Likes: 65
Either you are prone to hyperbole or just misinformed.
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