Driving down the road and gearing down to 3rd, when I did something sounded to come loose and the rattling began. I put it to 4th and the rattling continued. Not wanting to hurt it worse I didn't bother pressing the gas. I put it in 2nd and the rattling wasn't bad almost nonexistent. I was able to make it home. I'm able to put it in each gear with no hesitation. Anybody have any ideas what had happened?