I have a 2004 sunfire, it is a standard. when i switch from 3rd gear to 4th it makes a loud grind sound. it drives okay other than that, but what do you think it could be?

yeah it only happens switching from 3rd gear to the 4th gear. i push the clutch all the way down then i slide it into 4th and it makes that noise when i haven't even lifted the clutch yet. it is only between 3rd and 4th, its okay on 1st 2nd and going 4th to 5th isnt a problem. it engages about half way. i had my car for over a year and this is the very first problem i have ever had with it. yeah it only happens switching from 3rd gear to the 4th gear. i push the clutch all the way down then i slide it into 4th and it makes that noise when i haven't even lifted the clutch yet. it is only between 3rd and 4th, its okay on 1st 2nd and going 4th to 5th isnt a problem. it engages about half way. i had my car for over a year and this is the very first problem i have ever had with it.

If your clutch is ok, then the only other thing it could be is: the trans has synchronizers between gears. These synchronizers control the gears(they are like a guide for the gear, so the gear can't grind as it moves from one gear to the next) , so when you hear the grind between the 3rd & 4th gear the synchronizer is bad causing the gear to grind as it is switched. If your clutch is ok, then the only other thing it could be is: the trans has synchronizers between gears. These synchronizers control the gears(they are like a guide for the gear, so the gear can't grind as it moves from one gear to the next) , so when you hear the grind between the 3rd & 4th gear the synchronizer is bad causing the gear to grind as it is switched.