The first and second generation Expeditions had three different suspension systems. Which one they had depended largely on whether the vehicle was 4x2 or 4x4.

The standard suspension on 4x2 and 4x4 models was a non-adaptive steel setup with coil springs.

The optional suspension on 4x2 models was a rear electronically-controlled pneumatic adaptive suspension system. It can detect when a trailer is coupled and level the load. It also compensates for occupant and payloads.


The optional suspension on 4x4 models was a front & rear electronically-controlled pneumatic adaptive suspension system. Sometimes also called 4-CLL (4-corner load leveling) This system would rise about a inch or two when the transfer case was placed in 4-low-lock, to provide extra ground clearance. It could also detect when a trailer is coupled and other types of load or road changes. Unfortunately this system was a little too complex and seemed to give the most trouble. Note that there are some examples that did not give trouble.

For the third generation Expedition, there are only two different suspension systems.

A standard non-adaptive steel setup with coil springs, they all get 4-corner monotube shocks.

The optional suspension is a rear electronically-controlled pneumatic adaptive suspension system for both 4x2 and 4x4 versions. It comes with 4-corner monotube shocks. Again, it is "smart" enough that it can detect when a trailer is coupled and other types of load or road changes through electronic wizardry.

Ford dropped the 4-CLL suspension for the third generation Expedition. It is no longer offered, nor has it ever been offered.