'11-Up General QuestionsGeneral questions related to 2011-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.
The e-locking 3.55 has a switch you pull out (the 4x4 switch) and it will lock the rear axles together creating positive traction (both rear wheels turn at the same speed). A non limited slip rear axle means that only one wheel will be pulling at any given time and there will never be positive traction. Another option that is out there is called a limited slip, this is where durring normal driving only one rear wheel will do the pulling but under a load there are clutches that lock up and cause both rear wheels to do the pulling. Like Rut said, go with the e-locker!
I have an '09 F150 FX4 with the electronic locker and I'll never own another truck without it.
X2. I went from a limited slip F-150 to a brand X with a factory locker and the difference is night and day. I don't care if it's Electronic, air or auto, a locker is priceless. Put a good set of tires on and you can go a ton of places most 4wds can't in 2wd.
Ok, I was also baffled by the difference in price between 3.31 and 3.55 axle gears. Regardless of whether you get the e-locker or not, the 3.55 costs $1,375 more than the 3.31 in the KR or Lariat packages. The 3.55 gears cost $1,985 more in the XLT package. The 3.55 gears cost only $125 more in the XL package. The only reasoning I could figure out is WHAT WHEELS come standard with each gear ratio. The 20" wheels are normally an expensive option, but come at no extra charge if you pay for the 3.55 gears. They are not available on the XL, thus the XL has a much more reasonable price difference between the two ratios.
That's as much as I can figure out as to why there is the huge difference on price. I'm not sure what exactly is going on with the XLT, why they are so much more in that package than even the KR or Lariat. Oh, and checked the price difference in the XLT the first time it was a $1,595 difference, then the next time I tried it there was a $1,985 difference. I don't know why.
I mean, come on!! Who in their right mind thinks it's worth it to pay $1,375 more to switch from a 3.31 gear ratio to a 3.55 ratio, especially when they're rated for the same towing capacity from the factory??!!? THAT IS RETARDED !!!!!!
The $125 more with the XL is more in line with what optional gear ratios have always cost.