2005 Ford F-150 5.4L trition with a F-350 superduty engine swap

Asked by Feb 15, 2017 at 01:16 AM

Question type: Maintenance & Repair

Just trying to get better gas milage, and to even out the
weight. O2 sensors all need changed. Also wanting to do
something with the exhaust to get that loud deep tone as
well this spring. Is a 2WD truck.

5 Answers


As far as a muffler system, you could check out the flow master for the 150, has a nice sound, the defective 02 sensors are causing the bad gas mileage. Do a complete tuneup on the truck it will help with the fas mileage

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Check the rear differential ratio, the higher the ratio the less mpg you get but the pulling power increases, the lower the ratio the better mileage but you sacrifice pulling power. It seems like the best all around ratio is 3.54 on a Ford.

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Exhaust will not yield any difference in MPG. Engine needs to be properly tuned up and tire pressures need to be correct for best fuel mileage.

I just got new spark plugs and coil packs with the engine, what else should I do for the tune up?


Coils and plugs should do it.

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