02 fx4 45000 miles.been in 4 wheel drive 4 times drivind around front yard. I had transmission o]fluid change at 3o,000 miles. 4years ago before ford dealer went under I ask about front wheel drive service,they said none needer.finaly my question do i need to do any maintance to it.now. also had to get new tires for front tire were chiping out on side dealer said, It there tires that don,t do that,favtory goodyears. tommy