I own a 2007 Ranger Sport 4x4 with 16" wheels. I asked the local Ford service dept., and no one knew whether my rear axle was a 28 or 31 spline. Does anyone know for certain?

Performance Parts, Inc. has a kit with Cobra Brembro rotors, pads, calipers, caliper brackets, and anti-moan brackets for $490. Seems like a time-saver to me. Your input welcome.