904 Transmission Stopped Going Into Gear

First of all; never tighten the pump bolts if the input shaft won't turn. We tighten them gradually; making sure there's no binding. Do you have only one thrust washer on the front of the output shaft, one between the drums, and one on the back of the pump? Check the direct rings to make sure they're interlocked or maybe remove them for the end play check. The drum tabs don't interlock completely, but those look a little too far forward; not interlocking quite enough; maybe another 1/16" at least. If it all looks good, remove the output shaft washer and try it as a test. Is the tailshaft housing installed and the lock ring clicked into place on the output shaft bearing? Got a pic of the lock ring with the cover off? The one under the mount.