You do not want a Grand Cherokee with a 4.7 or 318.The Jeep Grand Cherokees with a 318 or 360 are gas hogs due to having fulltime 4wd.The 4.7 is not very reliable,head gaskets and once in a while a valve seat coming out of the cylinder heads making the cylinder head junk right away.Plus the 4.7 is very expensive to fix if anything major breaks.An used 4.7 goes for $1,500.00 out of a wrecking yard.Find one with a 4.0 since it has great fuel mileage and the 4.0 is very reliable engine which cannot be killed.