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The X codes were primarily recommended for trucks with snow plows on the front due the extra weight. X's have a combined weight rating of around 6,000# versus V-codes 5,200# rating.
I went with V's in my 05 6.0 and have been very satisfied.
'05 EXs most certainly do have leaf spring front suspension, just like all of the 4X4 EX build in all the years. The mighty EX did not get the suspension upgrades that the pickups got in '05, just the updated grille and bumper.
I run modded X codes leaves on the front of my '05 EX.
Now RWD EXs do have coil fronts, but that is a whole 'nuther thing.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.