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Thread: Gear Ratio for Dummies? 4speed vs 5speed

  1. #1
    Wing King jthill3's Avatar
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    Default Gear Ratio for Dummies? 4speed vs 5speed

    Hey folks - I am so ignorant on this so I am looking for a little help.

    Currently I have s stock '77 280Z coupe with a 4-speed. It runs 4000RPM at 80mph.

    I am looking at buying a 5-speed transmission core and rebuilding it. I have been told that would improve my highway MPG by almost 30%.

    Would this be worth it? Do you think this would help at all? Are there other things I could do instead?

    Thanks for any and all help.

    Tommy

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    Wing King jthill3's Avatar
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    Default Gear Ratio for dummies - part 2

    I am only getting 13mpg on the highway now and about 10mpg in the city.
    Last edited by jthill3; 08-12-2008 at 05:56 AM. Reason: spelling

  3. #3
    Former frequent poster sblake01's Avatar
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    I doubt the 30% increase claim, but if you're only getting 13/10 I'd say you have other issues. My 78 gets roughly twice those figures. You might try searching 'mpg' on this site.
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