There is a hole in the C3/4 frictions (not the oil slots). I know about the 12 o'clock piston hole, take a close look at a friction and you'll see what I mean. Can only think it's for aligning the frictions on the ring gears??? What do you think?
Put a line on the sun gear with a marker, then put each friction on lining it up with the mark. This way you can align each friction without being able to see the ones below it. Also remember to line up the steels.
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