A904 Rear Planet and Other Questions

For my first transmission rebuild I got a 1968 A904 from a junkyard, so I don't know the history. Pan rail is PK2892080Z 2621 3994. Been reading lots of threads, this site is a wealth of information.

First, is there supposed to be a flat steel washer between the rear planet and ring gear? There is a machined pad on the ring gear, red dot, but no washer present on the forward or rear planets. They are aluminum with 4 pinions.

Anyone ever use one of these? ATI TF904 Output Shaft Bearing Kit #904207, ATI Racing Transmissions - Chrysler Torqueflite TF904 Drag Race Transmissions , Do they work better than the fiber washer?

Thanks,
Robert

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