904 automatic transmission not shifting on any gears

Linkage is connected and shifts correct. I went under the car, had my father shift through the gears and yes the manual valve is moving in/out fully. everything looks very clean, new fluid and new filter.

We had no other choice then to bring the transmission down and inspect it more carefully. The ONLY that my father and I notice is that - (Please correct me with any technical names of parts)




When we spin the input shaft from the front of the transmission by hand while looking at the output shaft from the rear tail of the tranny - IT DOES NOT SPIN! We tried on all gears and it doesn't spin - ONLY just a centimeter of movement. Now when i put it on park i shouldn't be able to spin the input shaft... well this tranny you can STILL spin the input shaft by hand in park but output shaft still has the same problem as mention above.




Im trying to search online looking for a similar problem but haven't found one, maybe im describing/searching wrong? The thing that gets my father and I is how can a perfectly running transmission suddenly give up?


Transmission is off the car as of now until i find a solution. i'll post a few pictures of the tranny and a few pages of the transmission book i have, maybe it can help someone here as well. (The more picture the better)