I ran across something interesting and wanted to throw it out there for comments/feedback. I was researching leveling kits and ran across this from ReadyLIFT... They have two F-150 leveling kits for 2015-2020. One for trucks equipped with the FX4 package (1.5” lift) and another for non-FX4 trucks (2.25” lift).

“To ensure proper leveling kit fitment, using a plumb bob line (for a clean vertical) to measure from the center of the wheel hub to the bottom edge of the fender at the 12 oclock position while the wheels are pointing straight forward. If this measurement is greater than 22" then the truck already has some factory front lift compared to a base truck.”

They say that incorrectly using the 2.25” leveling kit on a truck with +22” distance may result in “overlift” and UCA suspension component interference and/or excessive ball joint wear.

Thoughts?

 

I think the are FOS about the FX4 needing a different kit.

 

I will just say that there are companies with a better reputation than Ready Lift who make no such distinction.

 

Possibly the FX4 has stiffer front springs causing it to ride slightly higher in the front but that's just a guess. I doubt the FX4's have different control arms or knuckle from the non-FX4.

Or as the first two replies suggest, BS.

 

Yes. I haven’t seen that anywhere else. Thus my surprise.

 

Rough country sells a 3" lift kit that states, you won't get the full 3" if you have a fx4 or snow plow package. Here at the bottom of page

 

It's BS, not sure why they say that.
First hand experience: My '17 I installed the Rancho Loaded coilovers, got 2.5" lift, his truck was NOT an FX4.
I removed those coilovers, and put them on my '20 FX4, got 2.5" lift on it as well.
And yes, prior to that install, I had 22.5" from center of hub to the top of the wheel arch.
All components, UCA, LCA, and mounts appeared the same on both trucks.

 

I don't know if it's true or not, and don't remember where I read it, but supposedly the FX4 is 1" higher on the front than a "regular" F-150.

 

I wouldn’t be surprised to find out that the fx4 is higher in the front. My 2018 FX4 with no modifications looks level to the eye but when I measure there is a 1.5” rake. 37.5” front and 39” back. Measured from ground to edge of center is wheel well.

measured again from center of wheel. 22.25 and 23.75 front to back.

 

I have a regular 4x4 and my front is 37 1/4 and rear at 39 1/4.

Someone with a 2020 FX4 go measure their truck and we'll have a ball park WAG and solve this riddle.

A consideration is that my truck has less than 300 miles, so I should see a bit more spring settling in the future.

PS: I measured mine from the ground to the bottom of the wheel well

Went back and measured mine from the center of the wheel to the fender.

22 1/4.