My car always grinds in second...What does this mean.

 

You most likely have a bad synchro.

 

that your synchros are bad
buy new ones
http://www.gearspeedinc.com
or a new tranny

 

first throw in some GM mesh tranny oil, this could either get rid of the grinding or lessens the griding or not help it at all but its worth doing it. My 3rd and 2nd starting going out in my y8 changed the tranny oil, it was good for day then back to normal, i just went out and bought a new tranny and clutch and threw it on.

 

synchromesh is a bandaid
it doesnt fix anything...just covers up the fact that you have a problem