1968 Ford LTD Differential Carrier Yukon Dura Grip - Ford 9 in. Rear - 31 Spline - Limited Slip - 4 Spring Aggressive Setup - May Chatter - Requires Longer Trac-Loc Bolts - 1.78 in. Bearing Journals - Rear guaranteed to replace your current 1968 Ford LTD Differential Carrier Yukon Dura Grip - Ford 9 in. Rear - 31 Spline - Limited Slip - 4 Spring Aggressive Setup - May Chatter - Requires Longer Trac-Loc Bolts - 1.78 in. Bearing Journals - Rear. 1968 Ford LTD Differential Carrier comes new OEM 1968 Ford LTD Differential Carrier aftermarket new 1968 Ford LTD Differential Carrier of remanufactured 1968 Ford LTD Differential Carrier Yukon Dura Grip - Ford 9 in. Rear - 31 Spline - Limited Slip - 4 Spring Aggressive Setup - May Chatter - Requires Longer Trac-Loc Bolts - 1.78 in. Bearing Journals - Rear.