Compression Ignition Addict
Join Date: Sep 2010
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I'm not real familiar with the 7.3 setup, but if its not designed to pull that weight in OD you can shorten life, or have a roadside failure. what has ford said over the years in reference to this? two things can fail, the actual gears being used in OD, or the lockup clutch. if the torque on the lockup clutch is too high it will begin to creep/slip by the time you actully feel it, or see the heat from that on the tranny temp gauge its just about fubar. at higher speeds like 75 toqrue is less critical but at 65 or less with that much weight you're pretty close to lugging it, and that is where you start getting into trouble. as a guide i would say if you can climb modest hills without an instant downshift, or you can accelerate gently without it dropping a gear, it prob ok to run that gear.
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2005 F350 srw Crewcab lariat. 6.0 diesel