904 Transmission Stopped Going Into Gear

The most important wear parts haven't even been disassembled in the pics. You can't inspect clutches without removing them from the drum. So far it's just a band and direct (not forward) drum. The forward drum has the shaft. The direct drum sometimes called the "front" drum is mistaken for the "forward" drum. And to make matters worse, some people call it the "frontward" drum. You'll find terminology all over the board so never trust that.

Fair enough, I know I still need to disassembly all the sub assemblies but I plan on replacing all the clutch disks regardless of what they look. They all come in the rebuild kits I'm looking at. Component names are tricky because everyone calls them different things.

So I at least need a "kickdown band" and "direct drum" at this point?

That planetary gear looked ok? Sure looks like it saw some wear..