My 2005 Hyundai Elantra has 85,000 miles and we are having trouble with the gear shift. It will not shift into 1st from neutral but will shift into 1st from 2nd. We recently replaced the clutch (about 3 months ago). We are about to go on a road trip and are wondering whether we should get it checked out before hand. Any ideas what could be causing this proble,?