Now, Now, they weren't holes, they were called Ventiports .. I'll have you know, I was a Buick Training Center Graduate 1969. On the first day of "school" there was a th400 on a table when we first walked in, all apart. The instructor said to me, there are over 800 parts in this tranny, by next month you will know them all. I said to myself, ain't no way. :) I was right.