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Old 09-18-2014, 08:38 AM   #1
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Exclamation Anyone regret 3.73's ?? - Anyone regret installing 3.55's ??

Hi guys, need a little help please.

I have a 6 speed manual shift 2014 v6 3.7

I am going to change the rear differential gears to either a 3.55 or a 3.73


I need insight and opinion please from those of you who have actually done this and have changed the gears in your car . -- Are you happy with your choice on your manual shift 3.7 ? - Or do wish you had gone bigger to a 3.73, or smaller to a 3.55?


Do some of you who did 3.73 wish you had installed 3.55 instead?
Reasons might be:
3.73 made it where you are shifting too much or shifting a lot more often than you care for
or it revs too high at 75 mph going down the freeway
or gas mileage suffered too much?


Do some of you who did 3.55 wish you had installed 3.73 instead?
Reasons might be it just didn't give you enough grunt and more torque, and now that you've had it a while you wish you would have installed 3.73 instead?



Thanks you all so very much for your help and sharing your experience.



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Old 09-18-2014, 08:44 AM   #2
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The stock tire is 28" tall, and on my GFs car i dropped her down to about a 26.5" tire... That needs to be said first, because it will effect what i am about to say.

We put 3.55s in her car, and its a blast, the car is super responsive, has massive passing power on the freeway, and just wants to go on an otherwise stock car with a tune. That being said, when you're just trying to do your daily commute, or run to the corner store... 3.55 is flirting with the line of too much gear. I can say without a doubt a 3.73 would be way too much on an m6 car, and we're probably going to end up putting a taller tire on her car at some point just to soak some of the 3.55 back up (her NT01s for the road course are 25.5"... yikes, we'll see how that goes). I believe on an M6 the comparison should be between the 3.31 and 3.55 personally.

Keep in mind, her car is basically stock except full suspension (with gears and tune obviously). She has the GT shocks / struts out of my car, Eibach springs, BMR LCAs and relocation brackets + PHB, so her car is tight, and it will spin the tires (275 35 19) on a hard 1-2 shift (if IM the one driving lol), so i imagine a 3.73 isn't going to be doing you any favors for traction down low.
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Old 09-18-2014, 11:33 AM   #3
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I put 3:55's in mine and its perfect for me. 2500 rpm at 80 mph and good throttle response in town. 3.73's would be too much gear for my tastes and freeway speeds.
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Old 09-18-2014, 04:03 PM   #4
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I have 3.55 and it's more than enough. I can't even imagine the amount of shifting with 2.73's, but it sounds awful.


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Old 09-18-2014, 04:10 PM   #5
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Question

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Originally Posted by iantrusive View Post

I have 3.55 and it's more than enough.

I can't even imagine the amount of shifting with 2.73's, but it sounds awful.

Did you mean 3.73 ??
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Old 09-18-2014, 04:11 PM   #6
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Quote:
Originally Posted by GT 1 View Post
Did you mean 3.73 ??

Yes I did woops


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Old 09-18-2014, 04:12 PM   #7
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Thanks iantrusive


Questions please for those who have manual shift cars with 3.73 gears...

Is 1st gear pretty much useless, meaning it goes by too quickly and you feel like you can start from a traffic light in 2nd gear instead of 1st gear?

Do you feel like you have to shift quite a bit more often with 3.73 than you did with your original gears?

What size tires do you have?

How many RPM at 80 mph?

How many mpg now after installing 3.73?


Many Thanks. Your help is truly appreciated.


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Old 09-18-2014, 07:59 PM   #8
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Quote:
Originally Posted by GT 1 View Post
Thanks iantrusive


Questions please for those who have manual shift cars with 3.73 gears...

Is 1st gear pretty much useless, meaning it goes by too quickly and you feel like you can start from a traffic light in 2nd gear instead of 1st gear?

Do you feel like you have to shift quite a bit more often with 3.73 than you did with your original gears?

What size tires do you have?

How many RPM at 80 mph?

How many mpg now after installing 3.73?


Many Thanks. Your help is truly appreciated.


.
Wow, is it gear week on ME? If your comparing 3.55s to 3.73s the difference is so minor some might be able to tell. Y'all have to remember that the difference between 3.55s and 3.73s is less then .2 ds rev. Its less of a jump then 3.31s to 3.55s. Shifting and mpg will be very minor. Either gear is a good choice.

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Old 09-19-2014, 09:41 AM   #9
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Question please for guys with * 3.73 * manual shift cars

What RPM are you going at 80 MPH, and is 1st gear pretty much useless, meaning 1st gear is over in only a couple of seconds, and you can take off from a traffic light in 2nd gear?
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Old 09-19-2014, 06:11 PM   #10
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Finally found a chart that shows MPH at whatever RPM with whichever Gear...

Results for 2.73 - vs - 3.73 are...

1850 RPM - vs - 2600 RPM at 80 MPH with stock size v6 17 inch tires - subtract about 2 mph for stock size 18 inch tires


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Old 09-19-2014, 06:26 PM   #11
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So, the question remaining is, with 3.73 is 1st gear pretty much useless?

What I mean is 1st gear over in only a couple of seconds before you have to shift to 2nd, and you can take off from a traffic light in 2nd gear?


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Old 09-19-2014, 06:33 PM   #12
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Quote:
Originally Posted by GT 1 View Post
So, the question remaining is, with 3.73 is 1st gear pretty much useless?

What I mean is 1st gear over in only a couple of seconds before you have to shift to 2nd, and you can take off from a traffic light in 2nd gear?


.
Youtube .....3.7 mustang manual 3.73 gear. Please.

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Old 09-19-2014, 07:38 PM   #13
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I installed the 3.55's. I think 1st gear is Almost but no completely useless in daily driving. only use it when i'm stopped on an incline or want to take off with some power. otherwise im pretty happy with the choice over factory 2.73's think i would have been happy with 3.31's as well. personally I wouldn't want to go any higher than I have. 2012 with factory 18" rims/tires. hope it helps.
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Old 09-20-2014, 04:56 PM   #14
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Anyone regret 3.73's ?? - Anyone regret installing 3.55's ??

I have 3.73s and I use 2nd gear as a starting gear. The only time I use 1st is if I want to launch the car hard. I wouldn't say 1st gear is useless but it comes and goes very fast, I want to say around 36-40mph at 7000rpms(never really looked to verify)


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