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post #1 of 7 (permalink) Old 03-03-2011, 07:27 PM Thread Starter
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what gear ratio to run?

well i finally had to retire my beloved 89 after 10 years and 470,000 kilometers of service due to cancer. so i bought a 95 f150that came from out west to replace it this one has the 300 inline 6 and e40d trans my complaint is the 3.08 gears and open diff just dont cut it so my question is what does every one else recomend for a gear ratio and what will it do to my gas miliage i was leaning towards the 3.55 or even a 3.73
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post #2 of 7 (permalink) Old 03-03-2011, 08:02 PM
 
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depends on what you're planning to do with it? You use it for working or cruising?



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post #3 of 7 (permalink) Old 03-03-2011, 08:10 PM Thread Starter
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daily driver ocassional light towing but will be hauling construction supplies often witch can run anywhere from a couple hundred pds to well over a thousand. but want to keep gas miliage in mind
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post #4 of 7 (permalink) Old 03-03-2011, 08:21 PM
 
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well as your aware the 4.9 doesn't get all that great gas mileage as it is (my truck used to be one till I swapped in a 5.0) but either way you go you'll notice an increase in get up and go. Personally I'd go with the 3.73's, you won't lose much in mileage but you'll definitely notice a difference in performance



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post #5 of 7 (permalink) Old 03-03-2011, 08:26 PM
 
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My 2 cents -- unless you mainly do a lot of highway driving, the main difference will be the speed at which your automatic transmission shifts at. I don't think it will affect your mileage very noticeably.

I remember reading an interesting article (can't remember where, sorry), written by a GM engineer. He explained the whole question of axle ratios vs. fuel mileage. The upshot, as I recall, was that while a higher ratio will *theoretically* decrease your mileage, based on their real-world studies, in *practise* people generally don't see a whole lot of difference in mileage. Pretty negligible usually.

I've got a 4.10 rear, so that made me feel better.

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post #6 of 7 (permalink) Old 03-03-2011, 08:53 PM Thread Starter
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well i cant currently complain about the fuel economy it gets now it is better than my old 89 witch was a 302 aod trans and 3.55 gears right now in dead of winter i am getting around 300 kilometers running the front 19 gallon tank. granted as said earlier the 302 was pushing 470,000 when it retired the 300 has 192,000 i just want a touch better acceleration from it and most important a limited slip lol
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post #7 of 7 (permalink) Old 03-03-2011, 10:21 PM
 
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I'm running 3.55 on a 4.9L. It does ok. 10L/100km but I'm running a the heavy 5-speed.

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