Most likely the snap ring for the overdrive servo broke and the piece is stuck in the valvebody. There are videos on youtube that detail how to fix it. It's not hard at all just be careful when removing and working on the valvebody. There are several check ***** inside that have to go back where they came from.
Ford senior master tech
Every 5.4 3V owner should have Lisle tool #65600
8L3Z-6M280-B updated VCT solenoids for 5.4 3V rattle