91 crx si tranny...whats best fluid?

I just got my AC Engine swap done. I wanted to get a rebuilt tranny but ran out of funds. Anyways, my si trans is pretty noisey. It chatters really bad once you get into 3rd gear and little in the others. I know I probably need a new trans but it's what I got for now. So I was just wondering if there are any good products out there that accuatly help the trans gears/sincros out. I heard about some stuff that Honda or GMC makes that is really good and works great from what people say. Anyone got suggestions? It's a 5 Speed btw. Thanks, -Jim.

BTW - I'm using 10w - 40 oil in the tranny rite now.

go to a gm dealer and pick up three bottles of a fluid called gm syncromesh tranny fluid with friction modifier. the part # is 12377916