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Old 10-16-2012, 10:46 PM   #1
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Which gears to buy

Do I'm wanting to put some gears in my 2011 gt 5.0 to give it a little more throttle response. I've got stock gears now but thinking of getting a set of 3.73 but not sure. I drive a lot of highway miles since my work is 45 min. Away. But like to play around on the weekends. Not sure on what to get. Don't want to kill my gas mileage either thou. Help
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Old 10-16-2012, 10:52 PM   #2
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My barely noticed any hit on my gas mileage. It's not like it kills it by 5mpg. I went with 4.10 and by what you wrote then 3.73 would be good
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Old 10-17-2012, 07:02 AM   #3
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I'm thinking about it as well from 3.31... I got used to my car now and I feel that theres not enough low end torque, this is definitely my next mod but I'm trying to find a quality shop that does Mustangs... I'm not one to leave my car at a shop for mods unless I really don't know what I'm doing and for this u really need to know your stuff and I don't want mine to be a guinea pig
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Old 10-17-2012, 07:17 AM   #4
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Quote:
Originally Posted by gtstyles2
I'm thinking about it as well from 3.31... I got used to my car now and I feel that theres not enough low end torque, this is definitely my next mod but I'm trying to find a quality shop that does Mustangs... I'm not one to leave my car at a shop for mods unless I really don't know what I'm doing and for this u really need to know your stuff and I don't want mine to be a guinea pig
If you plan on going Forced Induction in the future, i would keep the 3.31 gears. I think the 3.73 will wind out too quick unless you have a auto. But if you plan on staying Naturally Aspirated go 3.73 or 4.10
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Old 10-17-2012, 08:06 AM   #5
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Quote:
Originally Posted by Ravnus

If you plan on going Forced Induction in the future, i would keep the 3.31 gears. I think the 3.73 will wind out too quick unless you have a auto. But if you plan on staying Naturally Aspirated go 3.73 or 4.10
Yea I thought about that too, I don't plan to go FI for a good while so I think it's perfect for me right now... And I'm also running the stock intake manifold. I'll definitely keep my original 3.31 on the side if I ever decide going FI... I'm wondering how drastic is the change ,if its worth it
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Old 10-17-2012, 08:26 AM   #6
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Quote:
Originally Posted by gtstyles2

Yea I thought about that too, I don't plan to go FI for a good while so I think it's perfect for me right now... And I'm also running the stock intake manifold. I'll definitely keep my original 3.31 on the side if I ever decide going FI... I'm wondering how drastic is the change ,if its worth it
It's definitely worth it. I noticed a change just from 3.55s to 3.73s. I imagine it would be even more dramatic going from 3.31s to 3.73s. If you want the most bang for your buck and I know your car is not a DD, put 4.10s in it. You'll be amazed by the difference and wonder why you waited so long to do the swap.
Good luck Greg,
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Old 10-17-2012, 08:33 AM   #7
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I went 3.31 to 3.73 and there was about a 1mpg difference total. I drive about 30 mins highway to work now. You street MPG definitely gets better tho.

As for performance, it is a drastic improvement. Worth every penny to change to 3.73.

4.10 if you drive highway would be terrible. Your gas mileage would just die.
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Old 10-17-2012, 09:24 AM   #8
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What about 3.90s?
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Old 10-17-2012, 09:42 AM   #9
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Quote:
Originally Posted by nosympathy
I went 3.31 to 3.73 and there was about a 1mpg difference total. I drive about 30 mins highway to work now. You street MPG definitely gets better tho.

As for performance, it is a drastic improvement. Worth every penny to change to 3.73.

4.10 if you drive highway would be terrible. Your gas mileage would just die.
I have 4.10s and my gas mileage didn't die lol. Mines dropped maybe 1 or 2(at the most)
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Old 10-17-2012, 10:08 AM   #10
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Quote:
Originally Posted by Mweigt07
What about 3.90s?
3.90s are a great gear, in theory. But frpp doesn't make them and any other gear has tendency to want to whine real bad.
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Old 10-17-2012, 10:23 AM   #11
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^agreed with smozilla, stick to FRPP gears
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Old 10-17-2012, 11:19 AM   #12
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My car has a 3.90 gear in it, per the previous owner. It picks up and goes quicker, but it does whine pretty bad. Between it and the exhaust drone, it gets pretty obnoxious on road trips. I either want to have my 3.90 gear reinstalled (at least I will know it was done properly) and see if that takes care of the whine or go to 3.73. I haven't decided yet.
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Old 10-17-2012, 11:29 AM   #13
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I'm pro 4.10 all the way. Read the threads in my signature for more info.
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Old 10-17-2012, 12:13 PM   #14
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Quote:
Originally Posted by DWC_SmOziLLa

It's definitely worth it. I noticed a change just from 3.55s to 3.73s. I imagine it would be even more dramatic going from 3.31s to 3.73s. If you want the most bang for your buck and I know your car is not a DD, put 4.10s in it. You'll be amazed by the difference and wonder why you waited so long to do the swap.
Good luck Greg,
-Dave
Cool thanks Dave, I heard the same from ppl going 3.55 to 3.73... I'm gonna go with 3.73s but looking for a good Mustang shop to do it, I'm no good with that stuff... I'm guessing parts and labor it'll be $700 the most?
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Old 10-17-2012, 12:35 PM   #15
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Does anybody gave any quarter mile comparisons between 3:31 and 3:73 or really just any ratio to compare with 3:31
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Old 10-17-2012, 12:41 PM   #16
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I do not have comparisons but the nature of a shorter gear is to get the vehicle into the powerband more quickly and also provides better tq multiplication.

Think of it like bike gears, the bigger gears have more teeth and make it easier to accelerate faster and harder, same thing with rear axle gear ratios, they have more teeth and do the same thing.

Not sure of the difference but I usually hear its a couple to a few tenths
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Old 10-17-2012, 12:46 PM   #17
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Originally Posted by GrabberBlue5.0
I do not have comparisons but the nature of a shorter gear is to get the vehicle into the powerband more quickly and also provides better tq multiplication.

Think of it like bike gears, the bigger gears have more teeth and make it easier to accelerate faster and harder, same thing with rear axle gear ratios, they have more teeth and do the same thing.

Not sure of the difference but I usually hear its a couple to a few tenths
Thanks good explanation i've been wanting to got a 3:73 or 3:55 nothing to crazy its a daily driver for my wife :-/ and its also an auto would being an auto be a concern with higher gears?
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Old 10-17-2012, 02:25 PM   #18
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Nope just know that the auto is geared differently and that you won't achieve the same results as far as having a certain speed at certain rpms like you would put of the manual
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Old 10-17-2012, 02:27 PM   #19
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Richmond makes a 3.89 and they are a good company been around a long time
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Old 10-17-2012, 02:47 PM   #20
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4.10's running revs at 26+ at 70+
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Old 10-17-2012, 02:49 PM   #21
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I just want to chime in and say 3.55 us my favourite gear set I've ever driven. The 3.73 is a little quicker but I noticed a hit to economy. The 3.55 is nice and most Mustangs (stockish power) don't need 4 th in the quarter with 3.55. My 4 th gear change is at 109 ish mph. Quarter is about the same.
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Old 10-17-2012, 03:48 PM   #22
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Quote:
Originally Posted by DaBluedude
I just want to chime in and say 3.55 us my favourite gear set I've ever driven. The 3.73 is a little quicker but I noticed a hit to economy. The 3.55 is nice and most Mustangs (stockish power) don't need 4 th in the quarter with 3.55. My 4 th gear change is at 109 ish mph. Quarter is about the same.
Are you referring to that new edge in your sig?
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Old 10-17-2012, 06:39 PM   #23
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So I've got stock 3.15 I think from the factory. I'm driving a 2011 Mustang GT 5.0 automatic. If I switch to 3.73 gears. will that give me a hell of a lot more torque from the get-go at a dead stop because that is what I'm looking for but do not really want to compromise on gas mileage since I drive nearly 65 to 75 miles a day just to work alone.
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Old 10-18-2012, 02:48 AM   #24
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Originally Posted by GrabberBlue5.0

Are you referring to that new edge in your sig?
Yep.
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Old 10-18-2012, 04:51 AM   #25
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Is the frpp the ford racing brand on AM cause I am looking to go to 3.73's also. And I am new to the area I am living in and haven't been to a mechanic shop yet , what do to look for to find a reputable shop that does that kind of work
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Old 10-18-2012, 05:17 AM   #26
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Is the frpp the ford racing brand on AM cause I am looking to go to 3.73's also. And I am new to the area I am living in and haven't been to a mechanic shop yet , what do to look for to find a reputable shop that does that kind of work
Yes. AM carries the frrp gears. I would check Google for shop ratings in your city. Look for a performance shop. The cheapest deal isn't likely to be the best. Also ask some of the local muscle car guys. Most will point you to somewhere. Get it done once the right way and not by some kid who is referencing a install list every step haha.
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