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Gear Ratio for Dummies? 4speed vs 5speed


jthill3

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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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