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3.55 Gears VS. Stock in a 2012 GT

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Old 02-20-2012, 08:38 PM   #1
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Default 3.55 Gears VS. Stock in a 2012 GT

This is my first post to the forum. I also plan on making my FIRST Mustang purchase in the next few days. I am looking at buying a 2012 Mustang GT premium 5.0 with the Brembo package and 3.55 gears. Ideally, I'd probably have stuck with the stock gears if I had a choice, but as the 2012s become more scarce I have limited choices with the options I'm looking for. In fact, my salesman had to bring this car trailered in from Minnesota. (I live in Michigan).

I was hoping to hear from some people who may have the 3.55 gears in a 2011-12 GT and how it's worked for them. Or just to hear what difference I will see as compared to stock gears that come in this model. I plan on using this car as a daily driver when the weather is good. I'll be making frequent 2 hour trips on the freeway and will also most likely be racing some cars for fun here and there. I don't care much about MPG as my minivan presently gets like 19mpg on freeway--so I think any new Mustang will get better =) Again, compared to stock what differences will I see in acceleration? Top End? Thank you in advance!
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Old 02-20-2012, 08:42 PM   #2
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you're going to experience more torque down low, and you're going to be shifting a little faster/more often.

you'll enjoy them. I have the 3.73s, the 3.3s were just too tame and they felt slow / were slow to get into the powerband. 3.5s are a nice compromise between performance and efficiency.
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Old 02-21-2012, 08:47 AM   #3
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Sounds good. The nice thing is I get to take it for a test drive too. I had the oppurtunity to test drive the stock 3.31s so now I can see if I can notice a difference.

I heard it was a good middle ground, but it's always nice to hear a bit more reassurance =)
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Old 02-21-2012, 10:07 AM   #4
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I agree. I have the 3.73 in mine. Drove one with the 3.31 and really didn't like the low end at all. I am sure your options are limited at this point. I had a whale of a time finding a base coupe with a 3.73 rear end. 3.31 makes sense in the boss due to its higher power band with the boss intake but in the gt going 3.55 or higher is the right move.
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Old 02-21-2012, 10:57 AM   #5
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I have 3.55 gears in my manual CS car. I had the 3.73 gears in a brembo GT a few months before, and they were badass. It was more rowing though in stop and go traffic. But at WOT, those gears ripped. Now with the 3.55 gears, its much better in the stop and go but I do notice they dont rip as hard WOT. They still do pull like a ****, but not as dramatic. I thought about getting them again in my CS, but I have been hearing that the 5.55 gears are the best to have for the 1/4 mile so you dont have to shift into 5th. Overall I love them, but I do wish they were more mean on the street. But they are the best of both worlds.
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Old 02-21-2012, 12:08 PM   #6
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I don't care much about MPG
You answered your own question right there IMO. The only reason to not get the 3.55's or 3.73's is if you want to increase your MPG.
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Old 02-21-2012, 02:52 PM   #7
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Jiggy one probably has the best response... but I just want to throw out there that 4.10s rock haha the stock 3.31 in the manual and 3.15 in the auto is weak/lame... although my MPGs on the highway did drop to 22... and since i have the auto i dont have to worry about how much i have to shift (frequently doing 0-40 i go through 4 gears in 3 secs)
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Old 02-21-2012, 04:10 PM   #8
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Jiggy one probably has the best response... but I just want to throw out there that 4.10s rock haha the stock 3.31 in the manual and 3.15 in the auto is weak/lame... although my MPGs on the highway did drop to 22... and since i have the auto i dont have to worry about how much i have to shift (frequently doing 0-40 i go through 4 gears in 3 secs)
Hey Mishri totally off subject but I see you have the boss intake..any thoughts on how you feel about it. There are so many stories positive and negative love to hear your imput..
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Old 02-21-2012, 05:18 PM   #9
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Yeah i posted about it in 2 threads just today.

I didn't notice much of a difference except for at high RPM, now i lose traction pretty bad once i go past 6000RPM in the first 3 gears.

I think the people who will get the most out of it are drag racers chasing the lowest ET (goal for me is 12.5 I'd be faster than most street cars at my track, if i were at sea level i'd be aiming for 11.5). Also I think you should either have an automatic or be an excellent driver if you have a manual. It's hard to shift perfectly at 7600RPM and many people with manuals haven't been able to pull it off well resulting in worse ETs.

It's good for around .2 in the 1/4 mile according to most sources with an automatic or a pro driver. You can find them for $350 from tousley ford so that is a pretty good mod for the cost for people like me. but it's not for everyone. Also my 4.10 gears help with getting me into the upper RPM range and keeping me there. Also a mod most manual owners wouldn't want because 1st-3rd gear are very short and 4th is pretty short too.
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Old 02-21-2012, 07:19 PM   #10
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Wel it looks like my inability to choose what gears I get due to limited availability is a blessing in disguise. By the sounds of it, it seems I will be pretty happy with the 3.55s. It seems to be a nice compromise between the the sluggish stock gears and the more aggressive 3.73s.... thanks for the information everyone. If anyone else has the 3.55s I'd love to hear from you too.
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Old 02-21-2012, 07:50 PM   #11
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I went through the "gear" phase a couple years back when I started mods to my stock setup.Car came with 3:55 and I wanted more acceleration so I was toying with 3:73 or 4:10 and went 4:10. I wish today I had gone with 3:73 for great pick-up with better Hi-way (rpm) gas mileage. Mine is not a daily driver so I live with the higher rpm at hi-way speed.The higher gear is a lot of fun though. Now you can always take the car with 3:55 and do a gear mod to 3:73 for a few hundred bucks down the road ,best of both worlds!
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Old 02-22-2012, 09:59 AM   #12
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I also had 4.10s in my '07 GT automatic and my friend has them in his 06 GT manual with a KB supercharger. We both still liked the 4.10s. So I guess it just depends on the person and what sacrifices they are willing to make for the gear.
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Old 02-22-2012, 12:16 PM   #13
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I also had 4.10s in my '07 GT automatic and my friend has them in his 06 GT manual with a KB supercharger. We both still liked the 4.10s. So I guess it just depends on the person and what sacrifices they are willing to make for the gear.
3.73 + MT82 is about the same ratio as 4.10 + T5. If you put 4.10s in a MT82 you'll be shifting into fifth in the quarter mile (if that matters to you) and it would be a very aggressive gearing overall.
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Old 11-29-2012, 03:51 PM   #14
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I'm thinking of putting in 3.55 into my car this winter. Please let me know what you get for mileage out of yours as I too have a mustang gt 2012 with the 3.31. I'm going to be taking a road trip next summer and I want to know if I should wait until after the trip to change out gears. I know I'll get better mileage with the 3.31 but how much better is the quesiton
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Old 12-01-2012, 09:39 PM   #15
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I'm thinking of putting in 3.55 into my car this winter. Please let me know what you get for mileage out of yours as I too have a mustang gt 2012 with the 3.31. I'm going to be taking a road trip next summer and I want to know if I should wait until after the trip to change out gears. I know I'll get better mileage with the 3.31 but how much better is the quesiton
I have about 10,000 miles on my mustang now (and I just put it away for the winter...sad face). On average I would get about 16.8mpg. I drove mostly city but would go on 4 hour trips on the highway about once per month or so. I like acceleration too so you gotta factor that into it too. If you are going for a long car ride I would suggest waiting until after to change out the gears.
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Old 12-02-2012, 12:35 PM   #16
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I have about 10,000 miles on my mustang now (and I just put it away for the winter...sad face). On average I would get about 16.8mpg. I drove mostly city but would go on 4 hour trips on the highway about once per month or so. I like acceleration too so you gotta factor that into it too. If you are going for a long car ride I would suggest waiting until after to change out the gears.
When you went on the highway what did you get. I like acceleration too I have another option for a car that will get much better mileage. My typical heavy footed highway driving with the 3.31 would get me 24-25 at around 80-90 mph. So I'm curious what difference it makes on the highway specifically. City I don't pay attention to mileage because let's be honest. Define "city". City to me means having fun with some friends.
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Old 12-02-2012, 12:36 PM   #17
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I have gotten below 10 in the city.
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Old 12-02-2012, 05:35 PM   #18
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I drive 180 miles round trip to work almost every day. my 13 has 3.73s and I get about 23 mpg and at 80 mph my RPM meter is about 2350-2450

My 2011 had 3.15s in the Automatic, i was getting 19mpg (mostly due to age -car had almost 60k on it) but my RPM band was about 2000-2050.

I took a ride in a 13 today with 3.55s the RPM band was 2150-2250 at 80mph averaging about 24 mpg.
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Old 12-03-2012, 07:44 AM   #19
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4.10's in the automatic must have a crazy short first gear. The first gear is all ready so low, lower than the manuals. I bet hooking up out the hole is impossible.
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Old 12-05-2012, 01:23 PM   #20
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I had 3.55's in my '07 GT and really like them, great compromise between performance and economy. I have 3.73's in my '13 GT, it took some getting used to the 3.73's (you go through 1st very quickly) for a moment I contemplated moving to 3.55's to get back some drivability but after driving a few months I got used to the 3.73's and would not trade them.

If I can keep my foot out of the laud pedal (haha) I get almost 24 mpg on the highway which is fine for me.
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Old 12-05-2012, 01:23 PM
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