dd is an input, xfer, sun gear, output gear. just about every transmission on the planet has this set up. I run atf 4 with over 10,000 miles combined on all of MY OWN sled and not one failure yet. 5.00 a quart and you get at least 2 oil changes out of it. change oil every 500 mile and after the LAST ride of the year.
fyi for the new to dd guys.
M7 dd 3.5 oz
07-8 m8, m1 12 oz
09-11 m8, m1 15 oz
DD lite 6 oz
Ya that's what I thought. Put it back together last night after taking the cover off to inspect the DD.
I will be running ATF from now on.
Not sure the amount of oil I filled it to the line on the case.