GM Hydra-Matic 3L80 (TH400) transmission cutaway.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...y_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...on_cutaway.jpg
Previously:
https://www.homemadetools.net/forum/...962#post171693
https://www.homemadetools.net/forum/...216#post169105
https://www.homemadetools.net/forum/...157#post168847