The crossover tube (I forget the other name for it) comes from the HPOP to the back of each head. It is necessary to remove the transmission to fix it because the crossover tubes are at the very back of the motor. So the transmission, flexplate/flywheel and rear gear train cover all have to come off to get to it.
This link gives you a rough idea of what the tubes look like and where they go..
2005 Update Page 04 Turbo High Pressure pump/Discharge tube-Oil Branch Tube-IPR Valve
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99 F350 XLT 4x4, Crew Cab, 19.5s, Cummins 12V powered, with a few mods, SBC DD clutch
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