first off, do me a quick favor and quit calling it tranny oil. just call it tranny fluid. cus every time you call it oil. i start thinking of...well, oil. lol
here.. try this
http://www.gm-trucks.com/forums/inde...article&id=392
its a truck forum, but you the procedure is about the same as you should have a 4l60e tranny same as the trucks, camaros, fbods, and impallas and caprice's.