I bought a used 2005 grand cherokee laredo it says 4x4 on the back but there is no 4WD control?
It could automatic 4x4. Look under the vehicle to see if it has drive shafts going to the front wheels.
Go here and select your year. The VIN will tell you what it is. http://www.jeep4x4center.com/knowledge-base/VIN-grand-cherokee-2005-2010.htm
Search Jeep Grand Cherokee Questions
Jeep Grand Cherokee Experts