This exposes the OD apply piston/center support.
There are two snap rings. An external snap ring that retains the OD apply piston return spring assembly into the center support. It must be removed first. You can use pressure from your hand to force the spring plate back and get the snap ring started at one end then "spiral" it off, while working your pressure around the spring assembly.
Once removed it will look like this:
You can now remove the large internal snap ring that holds the center support in the case. This snap ring also works well for a TH400 intermediate pressure plate snap ring
Once the snap ring is removed, if you removed the center support bolts previously, it can be slid out of the case. It is a very snug fit.
It may come out with the direct drum and the forward drum.
