Join Date: Aug 2010
Location: Sassamansville, Pa
Thanked 196 Times in 157 Posts
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The factory gauge isn't accurate enough to give you a answer, you should be monitoring all your temps/psi/volts with a aftermarket solution.
Write Up: Monitoring the 6.0L PSD.
Once you have a accurate temp reading, we would be able to point you in the right direction. Now if you just wanna throw parts at it by guessing, start with a new thermostat.
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2004 F350 CC DRW King Ranch
X-3 tunes by DJ'S,QT,GH,ID. Gryphon FICM tunes, ARP studs,Stage 1turbo,ATS coolant recirc lines,Swamp's 48v ficm,coolant filter,AD2,Snow Perf stage II,EGR delete,4" turbo back straight pipe,S&Bintake,Quad "A" pillar autometer gauges,Suncoast Tri Disk Conv.,Billet input shaft,Suncoast superduty rebuild kit,Trans-go shift kit,Mag-Hytec trans pan,CFM+ elbow,ccv mod,15K reese 5er,17" LCD TV/DVD,Cobra 29 Nitewatch CB