I bought a 2010 FX4 S-Crew on Monday and love the truck. I know about it's locking differential in 4x4 hi & low but is it possible that it has a limited-slip differential while in 4x2? or do we only have a single drive wheel in the rear? I was curious because I "goosed" it while in the dirt the next day while only in 4x2 and both tires spun. any thoughts would be appreciated. Thanks
<!-- / message -->

 

I was under the impression that it was equipped with an open diff but if you have two skid marks, that may disprove my thoughts.

Tim

 

Who makes the locker? I know Auburn gear makes the "ected" locker... It is limited slip normally, but can be locked when you want it. would be a very cool thing indeed... More fun to get squirrely on a dirt road with a locker in 2Hi...
Maybe the traction control kicked in and braked one of the tires when it felt a slip? rather than 2 burnouts you had one burnout skid and a brake skid? Is this possible?

 

The FX4 comes standard with an ELD (e-locker).

 

There has to be an open diff for the traction control to work properly. Only in 4x4 mode can you lock the diff.

 

Yea, I understand the FX4 has a standard locker for 4x4 hi & lo and understand how it works. my question is can it also have a limited-slip differential also that works in the 4x2 mode and possibly even in 4x4 if the locker is not activated.
As to the other response, I know Nissan went with an electronical limited-slip awhile back that uses braking instead of a real mechanical limited-slip. There were no braking marks or lessened spin on one of the tires. the spin marks left in the dirt were pretty equal in length with no signs of braking.

It would be great to have a limited-slip in addition to the locker for times when you don't need 4wheel drive but need that little bit extra traction like when pulling a boat up a wet boat ramp, or just calm driving on a snow covered street, ect.

 

I know the FX4 comes with a selectable locker, that is why I ordered mine... What I meant is does Ford manufacture it or is it an aftermarket unit that Ford contracted to use? Like a detroit locker, Auburn, OX locker, etc...
If we knew who made the locker we may be able to figure out from thier website if it acts as a limited slip when not locked.

 

Aftermarket. If you use google, a free search, you would see that it's made by GKN.
Google search engine - GKN

GKN to provide E-locker for F-150.

 

It has to be open. Meaning there is no amount of slip limiting going on. Your stripes in the dirt are a result of both tires having the same amount of resistance, or lack thereof. Jack up the rear and spin a rear tire, the other will spin opposite, or not at all.
There can be no conection between the rear wheels for the stability managment/traction control to work.

 

According to GKN's website (the link provided above) it "Can be combined with any limited-slip differential". Whalebird, I'm assuming your logic is based on if the system does not monitor each wheel individually as opposed to just the rear end as a whole. Could it then be possible, if each wheel has a sensor to speed, that there is indeed a limited slip? I would love to know the genuine answer to this question as the rest of you. Mine feels like limited slip in 4x2 and there have been times when I don't believe the traction control/vehicle stability icon has been displayed and I've felt it "grab" the road like LS.

 

whalebird, I understand your logic on that but if that was the case then the two wheel drive trucks, which also have stability managment/traction control, could not be equipped with limited-slip, yet some models are.

 

So if you jack up the rear and spin the wheels: If they rotate in opposite directions that shows what ? And if the other side doesn't spin at all that means what ? Just confused and would like to know ! Thanks

 

That depends on the locker to be honest. GM truck you can spin the rear wheel up in the air and the other spins the opposite way unless you can spin it fast enough. I believe some will do lock right away, some will not.

 

Well if you look for the right thread your find the parts break down from ford and their is no limited slip parts

But if you leave the tracton control on you'll get two wheel pill for about 30 sec before it cuts power. Turn it off you'll get a one wheel pill

 

so, help me out here, from what Im reading, and from what a friend of mine said, the E-Locker should only be used in REAL off-roading situations? When I use 4X4, 90% of the time its in Michigan snow. So from what my friend had said, he would NOT use an E-Locker in "just snowy" conditions because it would be too rough on the locker. Is this correct?