Different trims, different redlines 7.3?
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Mountain Pass
Joined: Nov 2017
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Different trims, different redlines 7.3?
Anyone know why the new 7.3 Gas V8 has a redline of 5,500 RPM in a regular XLT or Lariat truck but the redline for this same engine is at 6,000 RPM on the Tremor? Also it seems the XLT shifts sooner where the Tremor revs right out to just about 6 grand before an up-shift. The power ratings are supposedly the same so why the difference in max revs? Gearing dependent? The actual clusters read 500 RPM different where the red starts as well.
Fleet Mechanic
Joined: Nov 2003
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I wonder if its tuned and mapped differently out of the factory. I remember once driving a 2005 FX4 5.4L F-150 back to back with a 2005 5.4L XLT F-150 and the FX4 felt so much more lively than the XLT. But in that case it could have been gearing, I think it was 3.55 vs 3.73's in the FX4 if I remember correctly.
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Mountain Pass
Joined: Nov 2017
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I wonder if its tuned and mapped differently out of the factory. I remember once driving a 2005 FX4 5.4L F-150 back to back with a 2005 5.4L XLT F-150 and the FX4 felt so much more lively than the XLT. But in that case it could have been gearing, I think it was 3.55 vs 3.73's in the FX4 if I remember correctly.
I don’t know why 3.55 are even offered on this engine, it should be 3.73 standard and then optional 4.30 much like the 6.2 gas job. The large gap in ratios has me perplexed when a 3.73 is a happy medium if you will.
Fleet Mechanic
Joined: Oct 2003
Posts: 1,371
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From: Green Springs, OH
I bet one gear ratio will be going away. Ford is probably seeing what the take rate is of ratios and will stop offering 3. Will probably end up being 3.55 and 4.30. At least they better keep 4.30
Tuned
Joined: Oct 2010
Posts: 273
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I found several 7.3L non tremor 4.30 trucks with a 6,000 redline, but also found non tremor 4.30’s with a 5,500 redline. Only difference was that the 6,000 redline trucks have the upgraded gauge cluster with the bigger productivity screen. I know... that doesn’t make a lick of sense. A truck’s redline doesn’t change based on a fancier gauge cluster... I also found 3.55 and 3.73 7.3L trucks with the 5,500 redlines and 6,000 redlines with the gauge cluster being the only difference. 
In this video, it looks like it reaches redline in 4 out of the first 6 gears.
In this video, it looks like it reaches redline in 4 out of the first 6 gears.
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Mountain Pass
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