I gave a Measure that was Different than CRASH's. I believe we are Both Correct as it would all Depend on where you Measure To and From. From End to End of the Tubes the Ranger's Rear Assembly is 51"s, however, Width between Wheel Mounting Surfaces is 56.5"s.
http://www.therangerstation.com/tech_library/Explorer8_8.html
typically, axle widths are given WMS to WMS, it is the critical measurement