If you offroad, you NEED to do it. one water crossing and it will 'pay for itself' (no water ingestion @ the seals). Another thing you should do is an aftermarket dif cover (like the ARB unit). Better defense against rocks, and a thick flange prevents the cover getting peeled off the mating face. And a unit like the ARB also reinforces the bearing cradles (important if you run larger tires or have a heavy foot)Tried finding this without asking, but found conflicting info.
Does a '16 Pro4X CC with AT need the vent mod?
If you keep it on the road, replacing the poppet valve is recommended.