i'd suggest going ahead and atleast dropping in a 44re, if not a nv4500 (if you can do a 5-sp) the tranny's are weak enough, go ahead and spend the money now, while you putting in a new engine
The 2010 Jeep Grand-Cherokee has a V6 engine.
The 2007 Jeep Grand-Cherokee has a V6 engine.
The 2013 Jeep Grand-Cherokee has a V6 engine.
The 2012 Jeep Grand-Cherokee has a V6 engine.
The 2009 Jeep Grand-Cherokee has a V6 engine.
The 2006 Jeep Grand-Cherokee has a V6 engine.
The 2014 Jeep Grand-Cherokee has a V6 engine.
The 2011 Jeep Grand-Cherokee has a V6 engine.
The 2003 Jeep Grand-Cherokee has an inline 6 engine.
The 2004 Jeep Grand-Cherokee has an inline 6 engine.
The 2010 Jeep Grand-Cherokee has a 3.7 L base engine size.
The 2013 Jeep Grand-Cherokee has a 3.6 L base engine size.