Clicky: How-To: Rear Disc Brake Conversion on Stock 28-Spline Ranger Rear-End
2010+ axles are SUPER SUPER expensive and very complicated....it's not worth the hassle of going in blindly. Plus VERY hard to locate considering the low numbers sold. Go the tried and true proven route of converting to Mustang disc brakes on a 8.8 28 spline.
That price seems a little steep for a simple axle rebuild....it's only about $150 in parts assuming you don't need a r&p. Has anyone actually looked at it to determine what's happening? Driveshaft slip sticking is common and a bad pinion bearing isn't rare but isn't common either. How many miles?
Ford only recalled the 2002 Fx4 Off Road axle if equipped with manual transmission. It was a design flaw with Torsen's differential. Only manuals because of the increased shock load, though several autos of the same model year and trim level experienced the same failure.