You may be very low in Transmission Fluid. Check your fluid level. If it is low, you should also look for a leak.
The 2011 Ford Expedition has rear wheel drive.
The 2002 Ford Expedition has rear wheel drive.
The 2009 Ford Expedition has rear wheel drive.
The 2008 Ford Expedition has rear wheel drive.
The 2001 Ford Expedition has rear wheel drive.
The 2010 Ford Expedition has rear wheel drive.
The 2013 Ford Expedition has rear wheel drive.
The 2007 Ford Expedition has rear wheel drive.
The 2006 Ford Expedition has rear wheel drive.
The 2004 Ford Expedition has rear wheel drive.
The 2005 Ford Expedition has rear wheel drive.
The 2012 Ford Expedition has rear wheel drive.