Compression Ignition Addict
Join Date: Mar 2010
Location: Helena, Mt.
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Some of this will depend on your gearing and tires:
Mind you I run the 4.30 gears on stock 245/75R17's:
On the flats: 2,000 rpm - 60 mph, loads will determine EGT's will settle.
On the grades: 2,200 - 2,500 rpm - 60-65mph, driving the truck off EGT's and EOT.
Both figures are in OD with the 5R110, if I feel the need to start moving more air/oil, I'll drop it down gears accourdingly.
Just like colo_dually says, it depends on the gear ratio, tranny(auto or manual), and tires. Also how much you are towing. I just towed 10k from Montana to Southern Cal. down I-15 running 3:73 gears on Toyo 255/85/16 Tires. I had to run up hills about 50-55 and some at 45 for a while. I would rather take my time to get there than blow an engine or tranny. I also run according to my temps. On long and steep grades I have to slow it down to keep temps in check. If I had the ability to manually control my fan it would be even better. Maybe someday. One thing to remember is just because your truck can run up a hill at highers speeds doesn't mean you should do it. Just my $.02 worth. Hope this helps
POLARBEAR - 2003 F-250 SD CC SB FX4, 6.0, 3:73 gears, EGR & Cooler Delete, Bulletproof Oil Cooler, ARP Studs, A.R.E. Topper, Bedrug, Zoodad, 5" Magnaflow turbo back, K & N cold air intake, coolant filter, EDGE INSIGHT CTS, SCT X3 Tuned by Vivian, Energy Suspension Master Bushing kit, RiffRaff Boots, Blue Spring, 6.4 Banjo's, Fumoto Oil Valve, Fumoto water drain plug, Whistler 2000 Watt Inverter, DC Power 200amp Alt. Rebuilt FICM w/Atlas 40, Riff Raff Boots and counting.
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