Just picked up a 2002 4.3L 4x4 Silverado with the NV3500 5 Speed trans in it. Shifts smoothly through all the gears except 2-3. Double clutching from 2nd to 3rd seems to help a little bit, but she doesn't want to go into third. Any ideas what could be going on here? Not sure if its a synchro problem or something else. Thanks