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Old 06-04-2014, 08:53 PM   #1
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Let's talk gears.

I'm rebuilding the rear end of the fox. The owner before hand put in 3.55. My fox is going to be a weekend driver and it might see some track time. Any ideas? Should I do 3.73? Will I see a big difference. Thanks.
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Old 06-04-2014, 09:20 PM   #2
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Knowing what mods and tranny type would help, but you're probably not going to notice much of a difference. I'm not saying you shouldnt put 3.73's in, but as far as the rmps go, its not gonna be much. I've got 3.55's in mine (and 4.10's in my new edge), but the 3.55's have worked just fine for me. Although I've got a vortech unit on mine.
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Old 06-04-2014, 09:22 PM   #3
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Dont forget if you switch gears, to factor in a new matching speedo gear. Nothing hard to do, but its a small thing to correct the speedo.
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Old 06-04-2014, 09:25 PM   #4
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Of coarse. What would be good for a weekend ripper with some mods.
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Old 06-05-2014, 07:44 AM   #5
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There isn't a speedo gear that will correct for 3.55s and up for anything after 1989. In 1990 Ford went to an 8 tooth drive gear, the most teeth any Ford driven gear had was 21 which will only correct for 3.27s. If you have a 1989 or earlier they had a 7 tooth drive gear which allows you to correct for up to 3.73s with the 21 tooth gear. OR you can pull the tailhshaft and swap the driven gear to a 6 or 7 tooth for whatever combo you want so keep that all in mind if you want an accurate speedo.

And plz don't mention the 23 tooth gear, it is a Chrysler mesh and will get eaten up in a Ford trans. Ask me how I know.

At any rate, I would go with 4.10s for a NA street car. Highway RPM with the .68 overdrive and 4.10s is not bad at all unless you like going 80 all the time and even then. 3.55s to 3.73s won't be a huge difference though.
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