2005 f150 fx4
 

Is there anything different on a fx4 than a stx besides wheels and shocks? I was thinking about getting the fx4 wheels or going with 18" wheels later on. Can I use the same tire size on my stx?

The FX4 package gives you different wheels, tires, lower gear ratio options and skid plates. You can use FX4 wheels without any problem although I would personally go with a nice aftermarket wheel.