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Old 03-02-2014, 10:50 AM   #1
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Gear choice

Hey all!

I'm a first time Mustang owner, and I currently have an automatic 2011 V6 Mustang Vert with an Airaid CAI, 91 Bama Race tune, and Borla S-type catback; however, I find the "pull" a bit disappointing when compared to my buddys' 350z and BMW 335 v6 turbo. I presume this is partly due to my 2.73 gears. (Yea I know there is a bhp and weight diff).

I use this car as a DD and drive roughly 80-90 miles 3x-4x a week. I use 93 octane gas.

90% highway
10% city

I've read countless threads about 4.1 gears for auto trannies; though, I know gas mileage suffers substantially above 65 mph, and I drive consistently ~70-80 mph (speedlimits). Driving 65 mph on the highway in florida would piss a lot of drivers off as the unofficial speed is +10 over limit.

Is the 4.1 for auto trannies all that its cracked up to be? Or is 3.73 the better choice considering my driving conditions?

I could spare 1-2 mpg drop highway (is that being too conservative). Any thoughts?
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Old 03-02-2014, 11:50 AM   #2
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You want 3.55 gears as that is the best of both worlds mpg/off the line pull. You could go 3.73 if you don't mind the 4-5 mpg loss and higher rpm while riding on the highway ~2500rpm. 4.10 will give horrible mpg for your application. It's what most recommend for auto but I wouldn't go 4.10 driving as much as you do on the highway.
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Old 03-02-2014, 12:51 PM   #3
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I drive about the same as you do. Go with 3.55!

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Old 03-02-2014, 01:37 PM   #4
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The 3.31 in the performance pack makes a big difference to me so I'd think 3.55 would be great without a major mpg sacrifice.

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Old 03-02-2014, 05:22 PM   #5
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4.10!
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Old 03-02-2014, 10:12 PM   #6
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Thank you everyone for the replies

I hadn't considered the 3.55 before now; though, I am intrigued.

Out of curiosity what would I need to get from say A.M. if I went with the Ford Racing Gears 3.55? I see there are a few add-ons but I dont understand what the additional options are for.

Ford Racing 3.55 Mustang Gears M-4209-G355A (10-14 GT) - Free Shipping
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Old 03-03-2014, 10:24 PM   #7
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Thanks all! Ill probably end up with 3.55 unless I talk myself into the 3.73s
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Old 03-04-2014, 12:03 AM   #8
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Is there a big difference between 3.55 and 3.73?
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Old 03-04-2014, 12:08 AM   #9
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Quote:
Originally Posted by sunnytan06 View Post
Is there a big difference between 3.55 and 3.73?
As far as I know about 300-400 rpms diff @ 80 mph
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Old 03-04-2014, 03:14 AM   #10
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Does anyone know what the 2014 mustang v6 with the track pack comes stock with? I have been told 3.31 gears? If that's so will I notice a big enough difference to swap to 3.73 or 4.10 gears?
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Old 03-04-2014, 03:33 AM   #11
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Mike, yes your car has 3.31 gears with the track pack. Its up to you but normally the rule is 3.73 gears for manual cars and 4.10 gears for autos. I had 3.73 gears in my auto and then switched to 4.10 gears. If you do alot of highway driving then get 3.73 gears. I went for all out performance so the slightly less mpg the 4.10 give over the 3.73 was worth it for me.
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Old 03-04-2014, 03:37 AM   #12
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Would I notice a big difference though?

---------- Post added at 09:37 AM ---------- Previous post was at 09:36 AM ----------

From the 3.31 to those
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Old 03-04-2014, 03:39 AM   #13
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Well then looks like 3.55 &3.73 doesn't have a big difference in mpg on highway. Might as well just go for 3.73 lol
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Old 03-04-2014, 11:57 AM   #14
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Quote:
Originally Posted by Mike2014V6 View Post
Would I notice a big difference though?

---------- Post added at 09:37 AM ---------- Previous post was at 09:36 AM ----------

From the 3.31 to those
If your trying to get the best time possible at the track then 3.73 is the way to go. For a daily driver on street tires unless your trying to compensate for after market wheel height or weight, stay with the 3.31. If my car came with 3.31 I wouldn't change them. I'm only changing gears in mine to help with the under 4k rpm lag with the 2.73. In an older stang I had, I went from 3.27 to 3.73 it wasnt a big enough difference to justify the $$$. But most of my time is spent on the highway it may have been different at the track.
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