In the brake rotors.
No, the front hubs are sealed units on a Grand Cherokee.
They are a sealed bearing and are not greaseable.
It shouldn't require pressing to remove the bearings.
A Grand Cherokee is either rear wheel drive or four wheel/all wheel drive.
The 4 wheel drive switch is located on top of the transfer case
The 2006 Jeep Grand-Cherokee has rear wheel drive.
The 2003 Jeep Grand-Cherokee has rear wheel drive.
The 2011 Jeep Grand-Cherokee has rear wheel drive.
The 2005 Jeep Grand-Cherokee has rear wheel drive.
The 2007 Jeep Grand-Cherokee has rear wheel drive.
The 2004 Jeep Grand-Cherokee has rear wheel drive.
The 2008 Jeep Grand-Cherokee has rear wheel drive.