if it was my truck, I'd run 4.56's...4.10's would work fine also tho. Its your call tho, anything between 4.10-4.56 would work good..

 

before i think 2001 the 4x4 off road LSD but there was no fx4 back then. there was 4x4 and 4x4 off road.

 

I can't either! The ice is a big LSD killer!!! ahhhhhh

 

Mines a '98 Lariat offroad package, with 3.55 LS, and I have no problem keeping up with anyone in the mud... At least anyone running the same size or slightly larger tires than me. I 285/70/17 Toyo O/C A/T's, and get plenty of traction in the mud.
I've always felt both front tires pulling in 4WD.

But here's where I'm confused. If there's a LS or open diff in the front, why is it recommended not to drive in 4WD on dry pavement? Even on hard packed dirt I can the front binding when turning when in 4WD. If it's an open diff, why?

 

They say its more difficult to corner? Sounds more like lawsuit prevention plan to me

 

No, because when you have a locker in a front end, turning puts a bad bind on the drivetrain b/c the inner and outer wheels are trying to turn at different speeds... I always thought that there was a locker or at least a LS in the front.

 

When you are in 4x4 the transfer case links the front wheels to the rear wheels.
Because the front wheels do not rotate at the same speed as the rear wheels the system will bind. The weakest point is the chain in the transfer case. Snap that and you will walk home. I have a friend who drag races his Reg cab 4x4 SuperDuty. It has a modded 6L that puts over 500 hp and 1100 lbs/ft to the wheels. He races in 4x4. The tires actually spin on the wheels. To verify that, he marked the tire and the wheel and after a run the mark on the tire had moved. The chain on the SD t-case is a little bit bigger than the F-150's.

JMC

 

time for some beadlocker rims...sounds like a mean *** truck!

 

So then why doesn't my 2007 FX4 SCREW have LSD? I got the friggin thing stuck the second day I had it and was towed out by a rusty friggin Dodge.

 

I just went and checked Ford's website again and it specifically states that my FX4 has limited slip. I'll be asking my dealer about this one when I take her in on Friday to get the DVD system and tonneau cover fixed.

 

let us know what the outcome is..thats wierd tho, when I get my FX4, that thing better have LSD!

 

Even with a limited slip you can get stuck. If one side has a lot more traction it can cause the clutches in the diff to slip and allow the wheel with the most traction just sit there. This is normal.
Then there is the problem of the tires...... Stock or OEM tires suck to begin with.

JMC

 

What had happened was that while turning around on a grid road my front passenger tire went off the edge and into the hardpack snow of the ditch (with all the snow we have you couldn't tell where the road ended and the ditch began). It was only in about a foot or foot and a half and dropped down about a foot or so. All of the other three tires were touching ground. I engaged 4LO but could still only get one front tire and one rear tire to turn. To look at the truck you would have figured no problem getting out, but I couldn't even get it to rock for me.

 

Fords LS suck. Ive had a number of Mustangs also and everyone had the Ls swapped for an eaton. People started saying you must drive hard or beat on your cars and trucks, thats crap I took care of all my cars and the LS still sucked. Ill be swapping out the LS on this truck also for some E-lockers.

 

Yea LS sucks... Im going to need more traction too. I heard the Lock-Rights were pretty good at a decent price..