Are 3.73 gears a big upgrade from 3.55s? - Mustang Evolution

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Old 01-09-2013, 04:08 PM   #1
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Are 3.73 gears a big upgrade from 3.55s?

Can anyone tell me if the performance gains going from 3.55 to 3.73 are worth the cost? I have an 08 Gt Convertible. I hear 410s are too much for regular highway driving. My current mods are JLT Series 3 CAI and Borla Stinger Axlebacks.


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Old 01-09-2013, 04:24 PM   #2
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im looking to do the same thing. but i have hot rod cams and a K and N CAI. ive heard the same thing about the 4.10s.
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Old 01-09-2013, 04:37 PM   #3
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Barely a diffrence but search this topic has been hit up alot on here already.
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Old 01-09-2013, 05:03 PM   #4
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im looking to do the same thing. but i have hot rod cams and a K and N CAI. ive heard the same thing about the 4.10s.
I went from 3.31 to 3.73. I have hot rod cams and a CAI. There was a difference, but really wish I had put 4.10s in.
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Old 01-09-2013, 05:57 PM   #5
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4.10s are fine on the freeway. I usually pull about 2400 rpms at 70. At 80 I'm at about 2600-2700 rpms. To me that's not a big deal. So if I was you I would go 4.10s. If you plan on a supercharger go 3.73
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Old 01-09-2013, 06:48 PM   #6
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i do plan on putting on a supercharger at some point.
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Old 01-10-2013, 05:03 AM   #7
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i do plan on putting on a supercharger at some point.
Then when you do gears go 3.73s
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Old 01-10-2013, 05:56 AM   #8
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I had 4.10s in my 05, I didn't care for them and wish I would have went with the 3.73s. They were good for the track, but no one else could drive the car.
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Old 01-10-2013, 06:07 AM   #9
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I would keep the 3:55
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Old 01-10-2013, 06:50 AM   #10
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I would keep the 3:55
Why do you say that. I have 3.31 and a few people told me to keep them since I was going supercharger and I never go to the drag strip
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Old 01-10-2013, 07:14 AM   #11
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Why do you say that. I have 3.31 and a few people told me to keep them since I was going supercharger and I never go to the drag strip
It's a good all around gear
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Old 01-10-2013, 07:34 AM   #12
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It's a good all around gear
So is it true what people are telling me one guy I actually believe since he has a gt with 3.31 with over 500hp. Very nice car just get confused over the science of the gears.
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Old 01-10-2013, 07:41 AM   #13
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I would keep the 3:55
Why? Do you speak from experience? Not enough of an upgrade?
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Old 01-10-2013, 07:52 AM   #14
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Why? Do you speak from experience? Not enough of an upgrade?
As usual it's all about what you're trying to accomplish. The jump to 3.73 will be an improvement, but not as much as 4.10 and not as much as 4.56 and so on. If you go 4.10, it's awesome, but you are barely ever in 1st and if you go SC then 1st gear is useless and almost can't even be used, because go to redline almost instantly. So for SC 3.73 seem to be the highest you want and still have drivability.
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Old 01-10-2013, 07:55 AM   #15
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Not the same car but I went 3.55 to 3.73 in my cobra and there was little difference. Should have gone bigger
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Old 01-10-2013, 07:57 AM   #16
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Originally Posted by Aggiesrok View Post

As usual it's all about what you're trying to accomplish. The jump to 3.73 will be an improvement, but not as much as 4.10 and not as much as 4.56 and so on. If you go 4.10, it's awesome, but you are barely ever in 1st and if you go SC then 1st gear is useless and almost can't even be used, because go to redline almost instantly. So for SC 3.73 seem to be the highest you want and still have drivability.
So Thats why a lot of guys around here with a lot of hp keep stock gears.
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Old 01-10-2013, 08:07 AM   #17
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So Thats why a lot of guys around here with a lot of hp keep stock gears.
That's also why you see new aftermarket transmissions with different 1st gear ratios available. It's about balancing. If its just about launching and drag type driving, then max the gears out. But usually you need to be able to drive it normally too.
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Old 01-10-2013, 08:42 AM   #18
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That's also why you see new aftermarket transmissions with different 1st gear ratios available. It's about balancing. If its just about launching and drag type driving, then max the gears out. But usually you need to be able to drive it normally too.
I agree with you and the route im going with mine its best i leave them alone.
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Old 01-10-2013, 09:52 AM   #19
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I was asking this in another posts. Didn't know if a jump to the 3.55's I have would be a huge improvement over the 3.73's that I was thinking about. I'm still not for sure of it but it seems like the best course at this time would be to keep the 3.55's and work on other things
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Old 01-10-2013, 10:01 AM   #20
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I was asking this in another posts. Didn't know if a jump to the 3.55's I have would be a huge improvement over the 3.73's that I was thinking about. I'm still not for sure of it but it seems like the best course at this time would be to keep the 3.55's and work on other things
You just have to figure out your path and how far you're gonna go. If you're plannng on SC, then TB, CMDP, Ford Racing Intake, 4.10's are all a waste of money. The SC will replace that stuff and you'll really need 3.73. But if you're only gonna do a few bolt ons, then gears make a huge difference and they're cheap compared to other stuff. On that note they are cheap enough to swap out again later.
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Old 01-10-2013, 11:54 AM   #21
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You just have to figure out your path and how far you're gonna go. If you're plannng on SC, then TB, CMDP, Ford Racing Intake, 4.10's are all a waste of money. The SC will replace that stuff and you'll really need 3.73. But if you're only gonna do a few bolt ons, then gears make a huge difference and they're cheap compared to other stuff. On that note they are cheap enough to swap out again later.
It depends what supercharger he goes with. If he goes positive displacement then yes those things are useless. If he goes centrifugal then those things would work nice with it. It all depends on what he wants to do.
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Old 01-10-2013, 11:59 AM   #22
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It depends what supercharger he goes with. If he goes positive displacement then yes those things are useless. If he goes centrifugal then those things would work nice with it. It all depends on what he wants to do.
Well all those things besides the 4.10s would go nice with the centri
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Old 01-10-2013, 01:33 PM   #23
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Well all those things besides the 4.10s would go nice with the centri
For whatever reason I'm always thinking twin screw, etc. and not centri. You're right.
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Old 01-10-2013, 02:09 PM   #24
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Originally Posted by 610swolf
I was asking this in another posts. Didn't know if a jump to the 3.55's I have would be a huge improvement over the 3.73's that I was thinking about. I'm still not for sure of it but it seems like the best course at this time would be to keep the 3.55's and work on other things
Huge difference, no, worth the money, yes.
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Old 01-10-2013, 02:43 PM   #25
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4.10s all the way. Before the cai and gears, I would get 27 mpg, and after the gears (but before the cai), I dropped down to 23.5 going 70 mph. But since then, I installed the cai and going 70 I get 25.8 mpg constantly now.
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Old 01-11-2013, 02:09 AM   #26
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It depends what supercharger he goes with. If he goes positive displacement then yes those things are useless. If he goes centrifugal then those things would work nice with it. It all depends on what he wants to do.
I have 4:10's and a supercharger and they work great together. I'm running the Vortech V3 and my 1st gear is fine, of course when I stomp on it I gotta be quick on the shift.
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Old 01-27-2013, 08:04 AM   #27
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I have the 4.10s and I have a cai straight pipe nitro tires and zex kits and Nama tunes amongst other things and I wish I would have went with the 4.56 gears as long as your careful and feather the gas your 60 times will go way down and ur *** will fly back in your seat
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Old 01-28-2013, 09:23 AM   #28
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4.10s and highway driving being bad is usually a complaint by people who do NOT have 4.10s. My mileage went up all around the board.
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Old 01-28-2013, 09:30 AM   #29
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I'm getting 5.38 gears. It'll be badass!!!!!!! Awesome launch and better mpg.
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Old 01-28-2013, 09:54 AM   #30
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I have the 4.10s and I have a cai straight pipe nitro tires and zex kits and Nama tunes amongst other things and I wish I would have went with the 4.56 gears as long as your careful and feather the gas your 60 times will go way down and ur *** will fly back in your seat
What have you run in the 1/4 with the zex
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Old 01-28-2013, 09:56 AM   #31
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I'm getting 5.38 gears. It'll be badass!!!!!!! Awesome launch and better mpg.
I didn't know you could get them that high! That's awesome! I want that!
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Old 01-28-2013, 03:46 PM   #32
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Simply put no
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Old 01-28-2013, 03:48 PM   #33
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I didn't know you could get them that high! That's awesome! I want that!
It was a joke bud.
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Old 01-28-2013, 04:52 PM   #34
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It was a joke bud.
Well that's why I've never heard of them!
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Old 01-28-2013, 05:08 PM   #35
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I haven't been able to go to a track yet I live in a place that doesn't have a strip. But me and a friend of mine timed a run and I got it in high 11s
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