Buy Tool: http://amzn.to/2EAeLDH
Buy Seal: http://amzn.to/2EvCncp

This video shows the procedure to remove and install a new seal in a TH350, TH400, 700R4 or 4L60 transmission. There is a removal tool available online or at NAPA for about $6. The tool part number is Evercraft 7769250. If you think your transmission pan seal is leaking, you might want to check your shift linkage seal first because if it is leaking it will run right along your pan seal which can be very misleading!