There isn't any sort of posi traction/ limited slip system in the rear axle.
Most are open, limited slip was an option.
The 2008 Jeep Grand-Cherokee has 58.4 in. of rear shoulder room.
The 2010 Jeep Grand-Cherokee has 39.3 in. of rear head room.
The 2002 Jeep Grand-Cherokee has 50.9 in. of rear hip room.
The 2003 Jeep Grand-Cherokee has 35.1 in. of rear leg room.
The 2009 Jeep Grand-Cherokee has 62.3 in. of rear hip room.
The 2012 Jeep Grand-Cherokee has 58.0 in. of rear shoulder room.
The 2001 Jeep Grand-Cherokee has 52.4 in. of rear hip room.
The 2001 Jeep Grand-Cherokee has 57.8 in. of rear shoulder room.
The 2006 Jeep Grand-Cherokee has 60.6 in. of rear hip room.
The 2010 Jeep Grand-Cherokee has 58.4 in. of rear shoulder room.
The 2003 Jeep Grand-Cherokee has 39.3 in. of rear head room.