Just as the subject states, I've been getting a light pop or thud coming from underneath the car when I put the car in first gear after coming to a stop. Like say for instance at a light if I'm in neutral then put it in first it'll pop. If I put it back in neutral I can go thru all the gears (even back into first) just fine w/o any other noises. There are no noises while driving and it has never popped out of gear. It has 34,000 on the clock. Anysuggestions? Synchros maybe?