1966 Mercury Comet Differential Carrier Yukon Dura Grip - Ford 8 in. Rear - 31 Spline - Limited Slip - 2 Spring Smooth Setup - Requires Longer Trac-Loc Bolts - Uses LM102949/ LM102910 Carrier Bearings - Rear guaranteed to replace your current 1966 Mercury Comet Differential Carrier Yukon Dura Grip - Ford 8 in. Rear - 31 Spline - Limited Slip - 2 Spring Smooth Setup - Requires Longer Trac-Loc Bolts - Uses LM102949/ LM102910 Carrier Bearings - Rear. 1966 Mercury Comet Differential Carrier comes new OEM 1966 Mercury Comet Differential Carrier aftermarket new 1966 Mercury Comet Differential Carrier of remanufactured 1966 Mercury Comet Differential Carrier Yukon Dura Grip - Ford 8 in. Rear - 31 Spline - Limited Slip - 2 Spring Smooth Setup - Requires Longer Trac-Loc Bolts - Uses LM102949/ LM102910 Carrier Bearings - Rear.