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Hi everyone. I have some questions about gearing. I have a 2006 Mustang GT and am trying to figure out the gearing I have. Not sure how to crunch the numbers though. Someone said to look on the tag on the door and that's fine if you know that there have been no changes made, but I bought it used and don't know if the previous owner made any changes or not. So I thought I'd give you guys the honor. I was on the wrong forum; the 2011 + V6 and they all had 6 speeds. They let me know I was on the wrong forum. So, here are my numbers. Help me out if you can.
In 3rd gear at 75 MPH I am running at 4400 RPM
In 4th at 93.5 MPH, I am turning 4000 RPM
In 5th, at 100 MPH I am turning 2900 RPM. Tire size in standard (because I'm Canadian I had to convert from metric) is 27.2X9.3R17.
Help me out if you can.
Thanks.
 

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You have to look at door hinge and than there's a website that decodes it.

Sent from my SAMSUNG-SM-N910A using Mustang Evolution mobile app
 

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Pm me the vin. Ill run it on fords system.
 

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You'll have a sticker on the diff cover that says what gears are in it. As long as no one has mess with it.


Pick your poison.
 
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