OTC 6604 Ford Explorer Transmission Fluid Fill AdapterThis is a required tool to fill or add fluid to the 5R55W automatic transmission used on 2003 and newer Ford ExplorersSame as Ford No. 307-437Operating instructions: remove fill plug from transmission, install No.OTC6604, fill transmission to correct fluid level, remove No. OTC6604 and reinstall fill plug in transmission Click Here. Double your traffic. Get Vendio Gallery – Now FREE!