Hi zijmer,
I got the idea from reading the "Torqueflite A-727, Transmission Handbook" written by Carl H. Munroe (ISBN: 978-1-55788-399-5). In the book Carl states that "a small hole can be drilled into the the case in the return passage from the cooler to provide more oil for the roller clutch and cams" (Aka. Sprag). Carl explains the hole should be 1/8" in Dia. and 3/4" from the inside edge of the case bore.
I though since I just installed a new bolt in unit and I had the case open why not add additional lubrication to the roller clutch :)
AlV
