That only is true under "normal" driving conditions! If you dunk your Jeep in deep water and get water in your transmission, you'll need to change the tranny fluid. You should get a copy of an owner's manual and read this stuff for yourself. Check out mopar's new HOAT antifreeze/coolant!

94 YJ, SOA, 2-1/2 Alcans, ARB-front, Detroit-Rear, 4.56:1 gears, Oasis Trailhead compressor, 4:1 Terra Lo, 37x12.50x15 SSR's, 8000 lb Ramsey, & etc.