I just put a Y21 B16A tranny in my 95 LS. Its a 5 speed tranny and it has a kaaz lsd installed in it. I used the Kaaz gear oil for lsd's and its a little under 2 quarts in the tranny. I know your supposed to have 2 1/5 quart. My problem is that when I downshift into 3rd at like say 35mph theres a small grind when going in. Then when Im upshifting to 2nd at higher rpm it grinds. I called hmotors(where I bought it from) and told him what I oil I was using and he told me to fill the rest of the tranny up with GM Syncromesh. He said that should help it out and decrease the grinding. Has anyone used this? I dont really want to rebuild my tranny right now. Anyone else have any ideas on what it could be or what I could do to help stop it. Thanks J