Originally Posted by fasteddy10

Mid 2000 and up for the coil pack head. 2001 block and older will work. You will have to change periphials on most of the year differences though. (manifolds, sensors harnesses etc.) Newer blocks are missing the bracket mounting bolt holes you need for the Cherokee on the right side of the engine block, and the timing case cover. The electronics and ignition is a major concern on almost every year different than the one you have, regardless of the year your working on. Generally the engines fit into four ranges. 95 and older 96 through 99 & early 2000, and then mid 2000 and 2001. Then 2002 up. There are many pieces of good advice withn these Forums. Take the time to read them. I just finised a swap on a 2001 Cherokee using an early 2000 engine. It worked, but had to fabricate brackets to hold the Coil Packs in place, and change all ignition parts from the 2001 to the 2000 engine, and the exhaust manifold with the dual Cats.