3.31 locking rear axle - Ford Powerstroke Diesel Forum
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Old 05-05-2011, 01:02 PM
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Question 3.31 locking rear axle

What's the scoop on the locker. Should I get it or not? Whoops, too late. I already did.

Anyway I plan on highway driving and a lot of towing. From what you guys know about it so far what is the best way to use it? Advantages and disadvantages.
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Old 05-05-2011, 07:18 PM
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I definitely like it and have used it many times off-road. I think it disengages above 30mph. (That speed may be incorrect but I haven't read up on it in a while.)
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Old 05-06-2011, 04:05 AM
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Awesome..use it in low traction when 4x4 is not really desired...it wil LOCK the rear wheels as a welded posi trac, meaning if you lock it, take a corner on asphalt one tire will bind, leaving marks on the asphalt...great tool. Disengages at 40-45 mpg I think...(automatically, then re engages again when you slow back down. I take traction control off when I use it)
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Old 05-06-2011, 04:32 AM
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I Think it's closer to 30-35 on the Disengage ?

I have the Ford book at work in My locker,I will find Out tonight if i can Remember LOL
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Old 05-06-2011, 06:16 AM
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Straight from the manual.

The electronic locking differential (ELD) is a device housed in the rear
axle which allows both rear wheels to turn at the same speed. It provides
added traction on slippery and/or off road surfaces, particularly when
one wheel is on a poor traction surface. The ELD may be locked or
unlocked by the vehicle operator and can be engaged or disengaged on
the fly. When the axle is unlocked it will function like a standard rear
axle. When the axle is locked it will not allow the rear wheels to rotate
at different speeds when turning. It is not recommended for use on good
traction surfaces such as dry pavement. Doing so may result in abnormal
driving behavior and noise while cornering and excessive tire wear.
The ELD is affected by the following conditions of your vehicle:
• On 2WD vehicles and 4WD vehicles in 2H (4X2) or 4H (4X4 High),
the ELD will not engage if the vehicle speed is above 25 mph
(40 km/h).
• On 2WD vehicles and 4WD vehicles in 2H (4X2) or 4H (4X4 High),
the ELD will automatically disengage at speeds above 25 mph
(40 km/h) and will automatically reengage at speeds below 19 mph
(30 km/h).
• On 4WD vehicles in 4L (4X4 Low), the ELD can be engaged at any
speed and will not automatically disengage
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Old 05-06-2011, 06:39 AM
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Thanks for the info,


Sounds like it should be useful. Going to get the truck now.
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