Originally Posted by T to the J
The only thing you would have to do is MAYBE new engine mounts..... besides that i kno for a fact that all the censors are the same (my whole family owns jeeps) but besides that it would be a easy swap....BTW when my 5.2 blows (210,000 mi.) im gonna swap a LS-7 camaro engine thats gonna be way harder than a 5.2
Go ahead try it (swapping to the 5.2), your gonna need a new transmission, computer, wiring harness, and the sensors are definitely not the same. Stay with the 4.0, it's a direct swap, and it'll last a lot longer than the 5.2 with proper care and maintenance. A 4.0 engine from a 92-98 XJ, ZJ, or TJ will be fine as long as it's the EFI motor. You may have to swap motor mount brackets, fuel rail, intake & exhaust manifolds, and accessory brackets. It's not that big of a deal if you have time, tools, and mechanical ability. I just did this on my 93 ZJ, took about a day from the time I lifted the hood till I drove it out of the shop. The donor motor came from a 92 XJ, and I had to swap everything I mentioned above.
When you do the LS7 swap get ready for a long summer watching your Jeep sit in the driveway. Do you really know what an LS7 is? That isn't going to fit without MAJOR changes to the frame and MAJOR suspension upgrades, not to mention serious driveline changes. You planning to stay with the factory axles, tcase, transmission? You're talking big block Chevy 454, stock was something like 465hp. AIN'T GONNA HAPPEN..............