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Discussion Starter #1
Is there ANY way to make the speedo/odo accurate again if you install 4.10 gear with AODE transmission? My local tuner said a gear tooth for 3.73 gear is as close as he could get but I'm wondering if there are any other tricks?
 

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If you can get ahold of a speedcal tool like a Dallas Speedcal then yes you can otherwise probably not. I have 4.10s in my 87 Grand Marquis with the aod and have the same issue.


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Discussion Starter #3
Yeah, from what I've seen those Speed Cal devices are hard to find these days.
 

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That’s the only way unfortuneately. You might get lucky and find a used one on ebay, they pop up every now and then.


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