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post #33 of (permalink) Old 03-06-2016
scottmach
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Quote:
Originally Posted by DOCinMD View Post
I’ll reference this thread for the various equations.
https://www.allfordmustangs.com/forums/2011-2014-mustang-talk/634146-3-73-final-drive-what-exact-ratio-each-gear.html
This info is on many different forums. I found a spreadsheet on some site a while back that uses to do all the rmp/speed ratios. To determine the final drive ratios just multiply the transmission ratio x rear gear.
The manual
1st – 3.66
2nd – 2.43
3rd – 1.69
4th – 1.32
5th – 1
6th – 0.65

Automatic
1st – 4.17
2nd – 2.34
3rd – 1.52
4th – 1.14
5th – 0.87
6th – 0.69
Multiply these by the 3.15, 3.73, or 4.10 to get the final drive.

You can see that after 1st the automatic is set up to be more of a grand tourer than a sports car. Even with a 4.10 rear 3-5th is still steeper in the manual with 3.73s


btw, thanks for the wielding tip. I hadn't ran across that thread before
This chart is flawed with the way you're reading it comparing the ratios of the auto and manual.

Trust me I have personal experience here. Going to a steeper rear gear in the auto is not the answer. Start with a good tune and go from there. The next step would be a converter. But no more than a 3.31 gear. It won't help at all. Many have thought differently only to later realize the error in their ways.

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