knocking noise? DRIVING ME CRAZY!
 

ok, so i have a 2004 f350 6.0 -- today I noticed a knocking sound when in drive and idle. After inspection, looks like my transmission lines in the front on both sides are pulsating like a heartbeat. Is this normal? I can hear it at idle (maybe during driving if it wasnt so loud), and I can feel it when I put my hands on the fender. On the bottom of the front, both sides (driver and passenger) the lines are pulsating... Bad filter? normal? something else? Please help!

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:sos:

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ok, here's the video... Changed the front filter there, so it's not that.