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They do not share fluid as they are both sealed units. I can post the overhaul procedures if you'd like when I get home (workin late)
I am sure I will get bashed for this. A buddy of mine that rebuilds, transfer cases, automatic transmissions. Another guy I know who does transmisions, motors, all kinds of repairs, and a local trans shop all told me to ditch the ATF in a 208 and run motor oil instead.