Hmmm...that doesn't square with most of what I've heard -- although if it was clear I'd already have the answer, lol!
Thanks for the info though.
Basically, there are two possibilities: 2.25" diameter bearings, or 2.5" bearings. Explorer axles are also the larger 3.25" diameter tube, and I believe they use the 2.5" bearings -- but you know Ford.
I'm not sure if the FX4 axle is the "high torque" one or not. I would have hoped for a specific section on it since it's so different from any other Ranger axle.