Ok i figured out what my rear end has in it. How much does every body think going from 2:75 ti 3:55 will hurt my mileage? I know it will make a huge difference in power.

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1987 F-150 300 L6 4sp 2wd
K&N, flowmasters

 

nevermind I was not thinking. I have now been properly informed that i already have 3:55. So what about upgrading to 3:73 or 4:10 with a detroit?

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1987 F-150 300 L6 4sp 2wd
K&N, flowmasters