All that you do if put the shifter in the four wheel drive position.
check vaccum lines on differential or by shift linkage
To disengage the 4-wheel drive on a 2005 Jeep Grand Cherokee Laredo with a 3.7 V6, shift the transmission into "Neutral." Then, locate the 4WD control switch or lever, depending on your model, and move it to the "2WD" position. Once in the correct position, shift the transmission back to "Drive" or "Park." Ensure that you are on a level surface and that the vehicle is not in motion while making this change.
The 2007 Jeep Grand-Cherokee has rear wheel drive.
The 2010 Jeep Grand-Cherokee has rear wheel drive.
The 2008 Jeep Grand-Cherokee has rear wheel drive.
The 2001 Jeep Grand-Cherokee has rear wheel drive.
The 2006 Jeep Grand-Cherokee has rear wheel drive.
The 2011 Jeep Grand-Cherokee has rear wheel drive.
The 2004 Jeep Grand-Cherokee has rear wheel drive.
The 2005 Jeep Grand-Cherokee has rear wheel drive.
The 2009 Jeep Grand-Cherokee has rear wheel drive.
The 2014 Jeep Grand-Cherokee has rear wheel drive.