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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.


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Old Thu, April 8th, 2010, 04:30 PM
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Sounds reasonable, especially for the transmission. I suspect the engine is operating at a reduced "load" too, so that would account for the lower CHT. I keep a fairly close eye on my CHT and TFT and as soon as I start climbing even a gentle slope (more engine load) the CHT goes up a bit. On downhill stretches, even if not coasting, because some gas is needed to overcome wind resistance and maintain speed, the CHT will go down.

I'm a bit surprised at the reduction in your CHT though.

All these conversations almost make me want to regear my truck, since I tow with it. (You'd think though, that the factory tow package would have included optimized gearing.)

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Old Thu, April 8th, 2010, 08:12 PM
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I'm also thinking about a milder regear. I'm looking for 3.93's to replace the 3.55s. That way, if/when I get bigger tires I'll aready be good for 33s or so. Mine is 2wd so it makes things much cheaper.
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Old Fri, April 9th, 2010, 12:16 AM
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Quote:
Originally Posted by Longshot270 View Post
I'm also thinking about a milder regear. I'm looking for 3.93's to replace the 3.55s. That way, if/when I get bigger tires I'll aready be good for 33s or so. Mine is 2wd so it makes things much cheaper.
And more options!
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