1970 GMC Suburban Differential Spool K25/K2500 Suburban - Dana 44 - Standard Rotation - For Use w/30 Spline Axles - Steel - 3.92 Ratio And Up - Front guaranteed to replace your current 1970 GMC Suburban Differential Spool K25/K2500 Suburban - Dana 44 - Standard Rotation - For Use w/30 Spline Axles - Steel - 3.92 Ratio And Up - Front. 1970 GMC Suburban Differential Spool comes new OEM 1970 GMC Suburban Differential Spool aftermarket new 1970 GMC Suburban Differential Spool of remanufactured 1970 GMC Suburban Differential Spool K25/K2500 Suburban - Dana 44 - Standard Rotation - For Use w/30 Spline Axles - Steel - 3.92 Ratio And Up - Front.