Change the fluid in your trans to a fluid called "Syncromesh". This fluid is made for GM manual transmissions, i.e. Chevy S10's.

I have a 92 GS with a YS1 cable transmission. Now I was very skeptacle about doing this but my friend, with a 92 gsr, highly recommended me to make the change and he guaranteed that at the least, my trans will not grind as bad if I changed to syncromesh. Another friend of mine also recommended that I make the switch because he told me his friends DC2 stopped grinding after using it.

So I made the change and I couldn't be any happier. My transmission stopped grinding. Don't ask me how it works just know that it does. Also, FYI the fluid seems slightly thinner than 10w30 motor oil.