GM 8.875in. 33 Spline 12 Bolt Car 4.10 Up Pro Series Limited Slip For Use With 33 Spline After Market Axles;For Use With 4.10 And Up Gears;Aggressively Preloaded Cone Style Clutch System;Smooth Street Operation; Hardened Spider Gears;4 Year Replacement Warranty CHEVROLET EL CAMINO BASE CUSTOM 1964 1965 1966 1967 1969 1970 1971 1972 3.2L (194) 3.8L (230) 4.1L (250) 4.6L (283) 4.6L (4638cc) 5.3L Chevy Small Block (327) 5.4L Chevy Small Block (327) 5.7L (350) 5L Chevy Small Block (307) 6.5L Chevy Big Block (396) 6.6L Chevy Big Block (402) 6.6L Chevy Small Block (400) 7.4L Chevy Big Block (454) GAS Auburn Gear Auburn Gear GM 8.875 Inch 33 Spline 12 Bolt Car 4.10 Up Pro Series Limited Slip - 5420117 5420117 Differentials