GM 8.875in. 12 Bolt Car 4.10 Up Ected Max Selectable Locker For Use With 30 Spline Axles;For Use With 4.10 And Up Gears; Able To Shift From Limited Slip To Spool On The Fly; No Additional Parts Needed;Smooth Street Operation;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 12 Bolt Car 4.10 Up Ected Max Selectable Locker - 545010 545010 Differentials