It currently has the 4.0 with 142k. I know it needs rear main because it pours oil. I popped off the valve cover and noticed 2 rockers had way too much play so likely cam needs replaced. The caked on oil along with other things has me thinking just replace it with a running engine rather than dragging it out. I'm fine with making the HO act as a renix because not interested in messing with wire harness. Next question is will transmission i have, will it bolt directly to either? The 96 cherokje thats for sale has everything included. 91 is just engine. Mine is the ba-10/5. How about the oil filter mounting too, mine sits on top unlike my yj. Are these other motors set up top also or can that be swapped over as well?