don't use GL-5 if you have soft metals in the trans, it'll be eaten away
http://www.lubrizol.com/DrivelineAdd...arOil/GL5.html
from that link, you can get a lube with GL-4 ratings
stay away from GL-5
http://www.redlineoil.com/product.aspx?pid=46&pcid=7
i can get these at my local advance auto parts; they can order it for you and you can pick them up at your local store with no additional shipping fees