That is a pain in the ***, I travel lots of times that LS keeps me moving, I thought my new FX4(which is due next week) would also work in 2 wheel drive or at least have LS. So I have just a straight single rear end in two wheel drive is that correct? E-Lock is not a big deal to me as I don't pound my truck through the mud, but I do travel in snow and without LS you can't even move with a regular rear end.

 

Yeah, but you have traction control, which works just the same. When I was driving on the wet roads today, the rear would slip and the TCS would detect it and kept the wheel from spinning and the rear from fishtailing. Otherwise I would have had to drive in 4wd.

 

The traction control works wonders. Despite being an open diff I can spin both rear tires in snow or on wet pavement, something none of my other one-leggers could do. Others have reported spinning all four wheels. The only time I lock the rear is when the traction difference is so great that the tc can't balance the torque out with the brakes, like climbing a rocky slope.

 

Let me understand this The traction control is similar to LS then, is that right? So if I am going up my driveway in 2 wheel drive and it is icy, as soon as one rear wheel spins the other wheel cuts in is that correct?

 

Yep, or if you have 4wd you can use that.

Actually I think it works by applying the brakes to the spinning wheel and sending power to the one not spinning.

 

How can you spin both tires with an open diff? Is anyone 1000000% sure that we don't have LSD all the time and E-locker optional on the FX4's?

 

Just got off the phone with the dealer, my truck (2010 FX4) is a LSD 3.73 axle with the E-locking rear-end.

 

There is a simple way to tell if you have a limited slip diff. just jack up the rear end and spin one of the wheels by hand, if the other spins in the same direction, its LSD if not its an open diff.

 

That is making me feel better, now is your dealer sure or just assuming? Sometimes dealers (not saying your) tell you what they think is the case and is not always the case. That is pretty obvious here on this discussion a lot of assumptions are being made.

 

FX4's with e-lockers definitely do NOT have limited slip. I would also like to know if traction control is enabled how you can spin tires at all continuously. If you are spinning it limits throttle control until you are no longer spinning. ABS brakes are also applied to the spinning wheel(s). There is no transfer of power.

I would assume with traction control off you could spin one wheel but not both.

 

Went and built by truck on line again, and here is what it say in the options for the FX4 LUX package Limited slip W/373 E-lock axle ratio
Says Limited slip but is that what they are calling the E-lock. Tried to paste the specs but I can't seem to paste anything here, any help.

 

A little video on fords traction control

http://www.youtube.com/watch?v=LFJI0tLMVpI

 

FX4 Luxury Package — Includes Dual-zone Electronic Automatic
Temperature Control; steering wheel with secondary audio/climate
controls; heated front seats; memory driver seat; power-adjustable
pedals with memory; Reverse Sensing System; body-color door handles
with SecuriCodeTM keyless-entry keypad; FX4 sport leather-trimmed,
10-way power front bucket seats; front flow-through console and floor
shifter; auto-dimming rearview mirror with microphone; power, heated
sideview mirrors with memory and body-color caps; AM/FM stereo/
6-disc in-dash CD changer; power-sliding rear privacy window with
defrost; and SYNC® (SuperCab and SuperCrew)

This is from the brochure. The online ordering system doesn't seem to be working very well but I couldn't find any evidence where they stated what you have seen. But I couldn't verify what the online FX4 Luxury package detail provides.

 

As nice as it would be to be a LSD with e-locker, I don't think they changed it from 2009 to 2010.

 

Guys this LSD vs. Open debate has been had before. Do some searching. The website is wrong. There are schematics posted on here. There are no clutches in the diff.