1975 Ford E Series Van Differential Spool E-350 Econoline - RWD - Dana 60 - For Use w/35 Spline Axles - Steel - 4.56 Ratio And Up - Rear guaranteed to replace your current 1975 Ford E Series Van Differential Spool E-350 Econoline - RWD - Dana 60 - For Use w/35 Spline Axles - Steel - 4.56 Ratio And Up - Rear. 1975 Ford E Series Van Differential Spool comes new OEM 1975 Ford E Series Van Differential Spool aftermarket new 1975 Ford E Series Van Differential Spool of remanufactured 1975 Ford E Series Van Differential Spool E-350 Econoline - RWD - Dana 60 - For Use w/35 Spline Axles - Steel - 4.56 Ratio And Up - Rear.