I don't know how the newer ones work but for both my 2003 and 2005, with tow/haul engaged, it would downshift when OFF throttle and speed increased about 4 mph. If speed continued to increase, it would downshift again. HOWEVER, it would not downshift if doing so would put the engine above some predetermined rpm. I also could trigger a downshift by stepping on the brake when OFF throttle. The operative condition here is I had to be off throttle, no accelerator application at all, for it to downshift automatically.
Has anyone with a 6.0L Ford checked the tach to see if the tick marks change to red above a certain rpm? That's how the redline is indicated on my Dodge (3200 rpm) and I was thinking my Fords were that way, too, although I was thinking 4200 rpm. I know Art said his doesn't have a red line but I'm wondering about the numbers and tick marks.
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