put the transfer case in 2 wheel high, if the light stays on a while after it is because there is a vacuum issue and the indicator is showing the wrong gear, this used to happen on my cherokee, give it a few minutes, you'll feel the front diff disengage.
The 2013 Jeep Grand-Cherokee has rear wheel drive.
All are either rear wheel drive or four wheel drive.
Rear wheel drive is standard, all wheel drive it an option.
Yes
No you can not, The frame is designed different on a 4-wheel drive.
The 2010 Jeep Wrangler has four wheel drive.
The 2005 Jeep Wrangler has four wheel drive.
The 2011 Jeep Wrangler has four wheel drive.
The 2012 Jeep Wrangler has four wheel drive.
The 2014 Jeep Wrangler has four wheel drive.
The 2013 Jeep Wrangler has four wheel drive.
The 2006 Jeep Wrangler has four wheel drive.
The 2007 Jeep Wrangler has four wheel drive.
The 2002 Jeep Wrangler has four wheel drive.
The 2009 Jeep Wrangler has four wheel drive.
The 2004 Jeep Wrangler has four wheel drive.
The 2001 Jeep Wrangler has four wheel drive.