2014 Jeep Wrangler Differential Spool 4WD - Dana 30 - 27 Spline - Spartan Locker - Installs into standard open carrier case - Requires early Dana 30 carrier for JK applications - - Front guaranteed to replace your current 2014 Jeep Wrangler Differential Spool 4WD - Dana 30 - 27 Spline - Spartan Locker - Installs into standard open carrier case - Requires early Dana 30 carrier for JK applications - - Front. 2014 Jeep Wrangler Differential Spool comes new OEM 2014 Jeep Wrangler Differential Spool aftermarket new 2014 Jeep Wrangler Differential Spool of remanufactured 2014 Jeep Wrangler Differential Spool 4WD - Dana 30 - 27 Spline - Spartan Locker - Installs into standard open carrier case - Requires early Dana 30 carrier for JK applications - - Front.