1976 GMC Suburban Differential Spool K25 Suburban - 4WD - GM 10.5 in. - 14 Bolt Cover - For Use w/30 Spline Axles - 4.10 Ratio And Down - Rear guaranteed to replace your current 1976 GMC Suburban Differential Spool K25 Suburban - 4WD - GM 10.5 in. - 14 Bolt Cover - For Use w/30 Spline Axles - 4.10 Ratio And Down - Rear. 1976 GMC Suburban Differential Spool comes new OEM 1976 GMC Suburban Differential Spool aftermarket new 1976 GMC Suburban Differential Spool of remanufactured 1976 GMC Suburban Differential Spool K25 Suburban - 4WD - GM 10.5 in. - 14 Bolt Cover - For Use w/30 Spline Axles - 4.10 Ratio And Down - Rear.