Rear Gears: 3.55s or 3.73s? - Mustang Evolution

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Old 09-28-2011, 02:11 AM   #1
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Rear Gears: 3.55s or 3.73s?

I'm having trouble deciding what rear gears will go best for my 2004 GT AUTOMATIC. This is my daily driver, however I'm willing to give up some MPGs for some better 1/4 times and a higher top speed (Realistically). I know the 3.73s will give me the better times, but I'm not sure if that'll be the best for highway speeds. I feel the 3.55s will be the perfect choice for maintaining a good highway RPM and still able to get much better 1/4 times than the stock 3.08s.

I'm looking for people's opinions, real life experiences, and anything people can offer me. Are 3.73s that drastic of a difference?
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Old 09-28-2011, 02:45 AM   #2
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Re: Rear Gears: 3.55s or 3.73s?

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Originally Posted by TheJigShow View Post
I'm having trouble deciding what rear gears will go best for my 2004 GT AUTOMATIC. This is my daily driver, however I'm willing to give up some MPGs for some better 1/4 times and a higher top speed (Realistically). I know the 3.73s will give me the better times, but I'm not sure if that'll be the best for highway speeds. I feel the 3.55s will be the perfect choice for maintaining a good highway RPM and still able to get much better 1/4 times than the stock 3.08s.

I'm looking for people's opinions, real life experiences, and anything people can offer me. Are 3.73s that drastic of a difference?
See this post - Gear Speed/RPM
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Old 09-28-2011, 06:54 AM   #3
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I have 3.73 highway an city driving are no problem.
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Old 09-28-2011, 07:18 AM   #4
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Re: Rear Gears: 3.55s or 3.73s?

I've got the 4.10s on mine, and i found that what people have said on here that it is fast as Hell city/hwy, but on the HWY I do loose MPGs. 3.73 will work fine for your Automatic.

---------- Post added at 08:18 AM ---------- Previous post was at 08:08 AM ----------

GOOD Post, liked the old RePost also.
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Old 09-28-2011, 08:57 AM   #5
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Re: Rear Gears: 3.55s or 3.73s?

3.73, the difference in your OEM 3.27 to 3.55s will be a MAJOR let down for you when its all done. I would even consider 4.10s for your auto as the gearing is worse compared to a manual and this helps even it out.
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Old 09-28-2011, 01:23 PM   #6
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Re: Rear Gears: 3.55s or 3.73s?

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3.73, the difference in your OEM 3.27 to 3.55s will be a MAJOR let down for you when its all done. I would even consider 4.10s for your auto as the gearing is worse compared to a manual and this helps even it out.
THis is completely true. Auto's gearing allow for a steeper gear. I would definitely invest in a handheld tuner if you don't have one because tuning the shift points will also shave down time on your 1/4. If I had an auto I would go with 4.10s because thats what I did in my manual and they still aren't terrible in terms of MPGs but they make the car into a savage beast from a dig.

If I had to choose between 3.55 and 3.73 for you, I'd most def go with 3.73... 3.55 in an auto is basically like having stock 3.27 in a manual. :p Lol
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