AOD + 3.73s... what speedo gear?
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Old August 3rd, 2009, 10:07 PM   #1
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AOD + 3.73s... what speedo gear?


Forgive me, I'm failing at the internet.

Can't seem to find what speedo gear I need for an AOD when going to 3.73s.

Thanks, guys.
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Old August 3rd, 2009, 10:24 PM   #2
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I think Ive got a link.
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Old August 3rd, 2009, 10:32 PM   #3
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couldnt find it. sorry.
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Old August 3rd, 2009, 10:35 PM   #4
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Thanks anyway, man.

I seem to remember coming across a page that said with an AOD the best you could do was get the 3.55 gear and live with the speedo being off, but I refuse to believe it.
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Old August 3rd, 2009, 10:37 PM   #5
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I have it out of my LRS.com catalog,

what year?
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Old August 3rd, 2009, 10:41 PM   #6
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Originally Posted by ReverendDexter View Post
Thanks anyway, man.

I seem to remember coming across a page that said with an AOD the best you could do was get the 3.55 gear and live with the speedo being off, but I refuse to believe it.
Well curiously, yes, in my catalog, for cars 1990-93, the highest they list is 3.55.

If your car is a 1984-89 auto:

3.27=19 tooth
355=20
373=21
410=23
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Old August 3rd, 2009, 10:41 PM   #7
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Originally Posted by 89Domindart View Post
I have it out of my LRS.com catalog,

what year?
1990
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Old August 4th, 2009, 08:57 AM   #8
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Here is a few links that should help you decide. Looks like the 23 tooth is listed for a 90 AOD with 3.55 & that is the highest tooth gear you can get so that should get you the closest with a 3.73 but still wont be 100% accurate.

Mustang Forums at StangNet - View Single Post - speedo gear calculator

Speedometer Info, FFR FAQ
http://www.ddperformance.com/PDF/SpeedoChart.pdf
mustang speedo gear chart - Google Search
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Last edited by dblzroracin; August 4th, 2009 at 09:03 AM.
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