06-24-2009, 10:11 PM
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Senior Member
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Join Date: Feb 2008
Location: Houston, TX
Vehicle: 2005 Ford F150 KR
Posts: 389
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I have to ask...why would you want to switch from a 3.73 to a 3.55?
With the weight of your 4x4 truck, you will likely see no difference, or worse fuel mileage as the engine will have to work harder.
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