Ok hear is what i got a 04 grand cherokee with the 4.0L it ticking so bad it sounds like a lifter and doesnt sound like a knock i think the head need to be changed. Now can i use a 4.0l head off my 2000 parts jeep cherokee or does it have to be a newer grand cherokee i dont know if they are the same or not figured i would post this and see what anyone knows before i get into this project