[clinebarger]

The only thing needed is a parking pawl cup plug, Comes in every 4L80E/TH400/TH350/700R4/4L60E rebuild kit.

Use the Cup Plug to block the Reverse passage in the case. (the passage to the right of the Center Support Bolt) I recommend using some type of Retainer Compound on the OD of the cup plug & let it set overnight.