Replacing Tub Seal

How do I replace the Tub Seal item (26). Im not even sure where to start.
Do i need to remove the tub to get at the seal?
Or remove the transmission? ( how would I do this)?

Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=FWS446GHS1

Click on the items picture and a new page will open with a Q&A about it.

Also the following manual may help.
http://appliancejunk.com/forums/index.php?action=downloads;sa=view;down=254