1972 Jeep CJ Models Differential Carrier CJ6 - Dana 30 - Yukon Grizzly Locker - Aftermarket 30 Spline Upgrade - 3.73 And Up Ratio - Requires 30 Spline Axles - Front guaranteed to replace your current 1972 Jeep CJ Models Differential Carrier CJ6 - Dana 30 - Yukon Grizzly Locker - Aftermarket 30 Spline Upgrade - 3.73 And Up Ratio - Requires 30 Spline Axles - Front. 1972 Jeep CJ Models Differential Carrier comes new OEM 1972 Jeep CJ Models Differential Carrier aftermarket new 1972 Jeep CJ Models Differential Carrier of remanufactured 1972 Jeep CJ Models Differential Carrier CJ6 - Dana 30 - Yukon Grizzly Locker - Aftermarket 30 Spline Upgrade - 3.73 And Up Ratio - Requires 30 Spline Axles - Front.