My 2007 Wrangler Sahara Unlimited is making a grinding noise underneath. It has just under 110,000 miles. Recently I drove it from Northern Illinois to St. Louis during several rainstorms which forced me to put it in 4wd for most of of the five hour drive. On the way home, I put it on cruise, however, I drove through 50 mph winds the entire way. When I needed to accelerate, I had to take it out of cruise. Now, it's making a grinding noise when I put it in gear and try to move it. The transfer case has been leaking for a while, but the trans fluid was full when I left. Any tips on what it could possibly be would be seriously appreciated.