1988 Ford E Series Van Differential Carrier E-350 Econoline - RWD - Yukon Dura Grip Positraction - Dana 80 Rear - 37 spline - 3.73 and down ratios - Rear guaranteed to replace your current 1988 Ford E Series Van Differential Carrier E-350 Econoline - RWD - Yukon Dura Grip Positraction - Dana 80 Rear - 37 spline - 3.73 and down ratios - Rear. 1988 Ford E Series Van Differential Carrier comes new OEM 1988 Ford E Series Van Differential Carrier aftermarket new 1988 Ford E Series Van Differential Carrier of remanufactured 1988 Ford E Series Van Differential Carrier E-350 Econoline - RWD - Yukon Dura Grip Positraction - Dana 80 Rear - 37 spline - 3.73 and down ratios - Rear.