The iboats forum moderators are excited to announce that at this time it appears the iboats forums posting pictures function is working once again. Though we cannot promise for how long, we're hoping for indefinitely.
Dexron ATF will do it. Some ATF types have stuff in it to modify how the clutches hold and are bad for steering systems (add friction-hard steering) I used to could tell you what we paid for that $11 a qt stuff off the bulk tanker truck, but I don't remember.
While you can use ATF (I do) the major manufacturers advise using the "special stuff". They claim that the ATF is less viscous (thicker) and will make the steering a bit harder to respond to the helm.