Prophylactic , sounds like a Medical Device!! My oldest kid 32 can come up with some words, but on the other hand he is a Blackhawk Helecopter Pilot. How about a little preventive maintenance. No noise yet. Front Driveline seems OK so far. Only 39k miles.
I also had a 99 Grand Cherokee that I lifted never had any drive line issues got rid of it at 135k mi.
My Dodge 2500 Diesel has a front drive line like your getting and I think my old CJ7 did too. New design not always better. But I never thought I would have a independent front end either.