Forgo the worry and get a snorkel! that way just in case you go too far. The diffs are vented on the tjs as well as the transfer case, but only to the the heighth of the door handles. so check the fluids often if you do a lot of deeop water. tranny you can be screwed on.try to vent that if you can get to the vent tube!

Jon

Jeep 2000 TJ Black Sahara, Safari Snorkel, 2" Budget Boost, New Long reach shocks, BFG Mud Terrains 265/75R16,KC Daylighters mounted on the windshield brackets www.mosquitocounty4x4.com