No. They haven't put a 4R100 behind a Power Stroke since 2003 (last of the 7.3's). 2003 6.0's up to 2010 6.4's have 5R110's, with the 6.0 5R having a little less than the 6.4 5R. The 2011 trucks have 6R140's.
Temps should average between 155-170 while daily driving, 170-185 while running the truck harder (light towing, hard runs through the gears unloaded). Heavy towing can get temps up in to the 210-230 degree range. Once you get in that 230 and higher range, the fluid is starting to cook itself.
Thanks for the info. My 2005 F350 was running about 140 so I was concerned about the higher temps I was seeing in my 550. Arer there any suggestions to lower the temp? Or should I not be concerned about it?
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