Hobbes80, I may take you up on that if I cant special order an FX4 with an LSD.

I have no need for the locker, most of my driving is highway and the computer unlocking the locker above 30mph does me no good.

 

Nifty... anyone on here know if this would even work? Obviously it would have to be wired differently to make it work... perhaps this would be the equivalent of bypassing the lock higher than 33mph etc...

 

I have a 2010 FX4 and I think it is an LSD with the locker. I hardly use FWD even in the snow. You can feel both tires spin. I have never had just one tire spin like an open diff. I have owned trucks with an open diff. If there is no traction you don't move. Maybe the TCS is that good but I doubt it.

 

Straight from the manual. Also has been talked about many times on forum.

Electronic locking differential (ELD) axle (if equipped)
This axle provides added traction on slippery and/or off road surfaces,
particularly when one wheel is on a poor traction surface. In normal
driving conditions the rear axle function as a standard axle. The ELD
may be locked or unlocked by the vehicle operator. Refer to Four-wheel
drive (4WD) operation section in this chapter for further detail on ELD
function and usage. 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. The ELD axle is not
recommended for use on good traction surfaces such as dry pavement.
Doing so may result in abnormal driving behavior while cornering and
excessive tire wear.

 

The locker only stays engaged at speeds in 4hi up to 25mph then it will unlock. In low you can have it up to 63 mph before it unlocks. I wouldnt use a locker in advers conditions at high speed............. dangerouse, A LSD would be better for you as its engaged all the time and at all speeds.

 

I know and I agree. The locker stays engaged to 66mph in 4lo... which is for a spinning wheel scenario in the mud where the speed may misjudge.

My thought is that the locker does it by integrating with the comp, right? Since I don't have the electronic transfer case in my STX, I would have to bypass some of the restrictions to make it work at all.

The question is, would it even be possible to make it work without the electronic transfer case, and what other weird effects.would I experience.... anyways, not trying to steal your thread... should probably make another to discuss if it were even possible.

 

straight from owners 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. 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 4WD control must be in either 4H (4X4 High) or 4L (4X4 Low)
mode.
• The ELD will not engage if the vehicle speed is above 20 mph
(30 km/h) in 4X4 High or 56 mph (90 km/h) in 4X4 Low.
• In 4H (4X4 High), the ELD will disengage at speeds above 25 mph
(40 km/h) and will automatically reengage at speeds below 20 mph
(30 km/h).
• In 4L (4X4 Low), the ELD will disengage at speeds above 62 mph
(100 km/h) and will automatically reengage at speeds below 56 mph
(90 km/h).
The ELD is designed for off-road use only and is not intended for use on
dry pavement.

Now to your question............. GKN makes the locker and wireing kit to install.......... so really you can buy that kit separate and use their wireing and switches to mount it. You will void your warrenty but you would have a locker that will stay locked, evenin 2wd. The locker only availible on 09-10 FX4 not any other trim. 2011 it will be availible to all trims, Except for the 6.2 V8............. wierd I know. You can get it with the EB though........... weirder i know.

Just to be clear, i dont feel that the locker would serve the OP's needs. BUT the TC associated with the new F150 is very good and acts almost identical IMO to a L/S.

 

Where can you buy it, been searching and haven't found it. I have been to the gkn website and they didn't list a price or where I could buy it from.

Also, with regard to the warranty, I asked the dealer about it and if it is the same manufacturer (which it is) and it was dealer installed with the same restrictions, they see no reason why it should void the warranty.

That does not mean they wouldn't change their mind if something happened or if I asked them to put it in writing before installing.

 

good find on the warrenty. I have not found a vendor but I know eaton makes one almost identical to it, they do sell it. I would call them and ask, other than that you would be the first on forum that I know of to truely pursue this mod.

 

Check out the GKN website -- you, as a consumer, will not be able to purchase their lockers anywhere, except maybe a junkyard! You have to go through Ford if you want it new.