I found this very informative.
Transmission Oil and Diff Oil - Change and Oil recommendation
https://r.tapatalk.com/shareLink?share_fid=5477&share_tid=31331&url=https%3A%2F%2Fwww%2Erenntech%2Eorg%2Fforums%2F index%2Ephp%3F%2Ftopic%2F31331-Transmission-Oil-and-Diff-Oil---Change-and-Oil-recommendation&share_type=t
I plan to go with the type IV from the Toyota dealer when I change my trans fluid next week. $7 a quart.
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