Any thoughts on the 3.55 vs the 3.73 diff for the 04 f150. Looks like you get an extra 1k tow capacity with the taller gears. But obviously some tradeoff with mileage. Any thoughts?

 

Superdog,
Assuming gas costs $1.53/gallon, that you drive 18k miles a year, and the difference in mileage between the two rear ends is 1 mpg average, the total yearly cost difference is only $116/year, or less than $10 per month. Sounds like a convincing argument for the 3.73 to me.
Cheers,
Loren