If it is the Cherokee and not Grand Cherokee, then that would be next to impossible due to the platform the chassis is based on. The other issue is that the rest of the rig would be torn up even if you could find a way to do it
What year is the 5.7L motor? Is it legal in your state to put an older motor like a 5.7 into a new platform? Check laws and regulations there.
I wouldn't bother. Why would you even be considering an engine swap in a brand spanking new vehicle? If you hate the existing motor that much, just buy a different vehicle you actually like.
Are you prepared to swap the transmission, transfercase, pay for custom driveshafts, and other necessary suspension and body modifcations to fit a conventional drivetrain? You have to do all that becuase its so new that no one will have adapters to go between those drivetrains.
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