was out playing a little bit last week and got into some pretty sticky mud and had to back out of it and had all 4 tires spinning havent looked at tag on diff was wondering if andbody knew if the 06 4x4 came with limited slip in front axle same as the rear axle

 

NOPE, all front axles are "open" differentials from the factory. Limited slip isn't even an option, FX4 or not, but they can be added aftermarket.

 

r u sure? i thought fx4 got a lsd?

 

LS is standard in the rear axle on the FX4, LS is not offered by Ford in the front axle. I have the LS rear also and a few times when in 4low I have kicked up sand at the beach with all four. I cant explain it. Anyone have any ideas?

 

There are a couple circumstances where an open differential will put power to both wheels. It only happens when both wheels have EXACTLY the same traction on a given surface, OR if both wheels are off the ground. I've done it too, but very rare.

 

and who makes a LS for the front end?

 

Neggy, The front end is just a 8.8" Ford axle. Eaton, Auburn, make limited slips for it, and you can even get detroit lockers, truetracs, and E-lockers for it.

 

make sure if you get you diff for a 28 spline 8.8 not a 31 spline. A friend of mine gave me a LSD for a 28 spline 8.8 so when i put my 4.10s in it im just gonna throw it in there

 

are the heavy payload trucks using the same front axle? I know the rear end is a 10.25 gearset, I've never researched what the front is

 

TATTERED is right. I should've mentioned that. The 31 spline diffs are for rear applications, and 28's are for the front. And YES, the 7700GVW F150 and light duty F250 trucks use the same front axle.