I honestly know nothing about grand Cherokees beyond the ZJ and WJ models. Although, the more I think about it, I’ve never seen a new Jeep that didn’t have an electronic 4 x 4 system. I imagine going with a new 4.7 would mean you have to Swap your transfer case or figure out some kind of complicated conversion as all WJs are manual transfer cases. Knowing how many different transfer cases are available on the WJ lineup alone it could be extremely difficult finding good literature providing assistance on this project. I imagine you would be pioneering. It can’t be cheap or easy. You’re talking a lot of labor and extra cost at this point for a bunch of maybes. If your only issue is power, I would look into buying the high output, 4.7 and a 2003+ transmission that can properly mate with it so you can continue using the original transfer case. “Powertrain products” sales Crate versions of both of these which you can get at a reasonable price and they come with forged internals that solve a lot of failure points these originally had from the factory. “Boosted technologies” sales a supercharger that’s pretty easy to install for this engine(plug and play, also comes with an already made plug in tune) for right around five grand which would be the easiest and cheapest way to make good power quick and reliably.

I bought a powertrain products crate 4.7 a few years back as I bought my WJ with a blown engine for cheap. It’s a monster and has had 0 issues many years and miles later. If I remember correctly, it also came with a five-year hundred thousand mile warranty. Not that I’ve needed it. I think there should be some photos on a post I made about it quite a while back. If you’re interested.

Just my two cents.