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Trying to understand everything you're saying...
A couple things that might be helpful. A Power Stroke Diesel generates a lot of torque. So, it doesn't need lots of RPM's like a gas engine to really get the mass of your van moving. Additionally, it doesn't have a high "redline". A gas engine will rev out further.
Another thing, and this is a Ford issue, is that the jump between the Drive gear (D) and the Overdrive gear is pretty big. 1.0 to .71. That might be that "loss of power". Additionally, the E40D's and the 4R100's kind of slide really slowly from that third to fourth (overdrive) gear. Usually, that change comes at around 47MPH or so on the PSD vehicles I have had.
That give you some ideas and some direction for more questions?
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Super Dave
2006 E350 6.0PSD
2003 Excursion Limited 4WD 7.3PSD - Sold
1996 E350 Super Duty bus 7.3PSD - Sold
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