3.31 swap for 3.73 or 4.10?

DarkKnight2012 · February 3rd, 2012, 02:06 AM

First off, I'm new to the forum and I already know this topic has probably been discussed to death but, I have a 2012 manual GT with 3.31 gears and I've decided a gear swap would be the quickest way to get noticeable results and make sure camaroes aren't a problem. I had decided on 3.73s but the guy at the shop I'm getting the work done at suggested 4.10s.

I had thought the 4.10s would be too aggressive for d/d but he seemed to think it would make no noticeable difference in drivability. I am mostly concerned with what this could potentially do to 1/4 et's and 0-60 since it will undoubtedly require an extra shift for each. Will the gained acceleration outweigh the time needed for the extra shift?

Does anyone have any actual track times or any data for the kind of changes in mpg and theoretical top speed?

swervo · February 3rd, 2012, 02:23 AM

I went from 3.31s to 3.73s. Perfect gear for a DD. No 1/4 mile times though

DarkKnight2012 · February 3rd, 2012, 02:32 AM

I know I'd probably be happy with 3.73s right now I guess my concern is I plan to go to bigger wheels down the road and wonder if that will make me wish I got 4.10s...

I'm also very curious about how the shifting times up with 4.10's I guess I'm afraid I'll run out of gear to quick.

swervo · February 3rd, 2012, 02:39 AM

I have big wheels and tires. My rears are 11" wide with a 28" tall tire. Still feels peppy to me.

DarkKnight2012 · February 3rd, 2012, 02:57 AM

Are you able to hit 60 in second?

swervo · February 3rd, 2012, 03:00 AM

Yup. Plus I have a Boss intake and raised my redline to 7500.

pghdjspaz · February 3rd, 2012, 12:39 PM

The 3.73's are amazing but my cousin races his mustangs an highly suggests the 4.10's. I'm not sure of his times but his cars are insane.

Austin_ · February 3rd, 2012, 02:04 PM

Just throwing this out there, I've heard of two cars that went faster running a taller gear. From 3.73s to 3.55s the guy picked up a tenth or more and 3 mph in the quarter and another 10 second car that went from a 3.90 to a 3.55 and went faster as well.

98SilverStang · February 3rd, 2012, 02:14 PM

Originally Posted by Austinj427

Just throwing this out there, I've heard of two cars that went faster running a taller gear. From 3.73s to 3.55s the guy picked up a tenth or more and 3 mph in the quarter and another 10 second car that went from a 3.90 to a 3.55 and went faster as well.

But were they f/I or N/A

Sent from my Autoguide iPhone app

zinc02GT · February 3rd, 2012, 02:21 PM

Originally Posted by 98SilverStang

But were they f/I or N/A

Sent from my Autoguide iPhone app

Also transmission gearing takes affect too...

For regular driving and weekend racer status 3.73's are the best bet with these cars.

98SilverStang · February 3rd, 2012, 02:31 PM

Originally Posted by zinc02GT

Also transmission gearing takes affect too...

For regular driving and weekend racer status 3.73's are the best bet with these cars.

Thought about that right after I posted

Sent from my Autoguide iPhone app

Alejandro5.0 · February 3rd, 2012, 02:37 PM

3.73

Austin_ · February 3rd, 2012, 06:12 PM

Originally Posted by 98SilverStang

But were they f/I or N/A

Sent from my Autoguide iPhone app

Originally Posted by zinc02GT

Also transmission gearing takes affect too...

For regular driving and weekend racer status 3.73's are the best bet with these cars.

I'll double check but I'm almost positive the car with 3.90s was an automatic and I know it was supercharged.

The other car was just an intake/tune/exhaust manual 5.0 with a good set of tires.

DarkKnight2012 · February 3rd, 2012, 06:27 PM

Originally Posted by Austinj427

Just throwing this out there, I've heard of two cars that went faster running a taller gear. From 3.73s to 3.55s the guy picked up a tenth or more and 3 mph in the quarter and another 10 second car that went from a 3.90 to a 3.55 and went faster as well.

Was that on average? If he only did a run or two before the swap and one after then that may not mean as much.

whitemach · February 4th, 2012, 02:49 AM

4.10s will slow you in the quarter,,,,,,,,,,,,,,,,,you cant make it with out going to 5th......i know i went from 4.10s to 3.73 and went faster!!!!!!!!!

MachWon · February 4th, 2012, 09:34 AM

I'm researching the same thing and here are some M6 3.73 geared theoreticals based on gear calculators that are available

27" tire = 114 mph at 7,000 rpms, 4th gear (OE tire diameter)
28" tire = 118 mph at 7,000 rpms, 4th gear

Bumping the redline just 100-200 rpm raises the 28" tire-4th gear max to 120-121 mph

mbreinin · February 6th, 2012, 12:30 PM

Shaun at AED went from 3.73s to 3.55s. With a 28 inch tire he picked up 2 tenths and 3 mph. He tunes my car. I run 3.31s with a 26 inch tire and Shaun recommended keeping it that way. I will be going to the track hopefully this Wednesday for some times with his tune. I just loaded it up yesterday.

3.55s are perfect for the track, although for street action (which is rarely a full 1/4), you may get better results from a deeper gear.

Mike

DarkKnight2012 · February 6th, 2012, 11:46 PM

Thanks everyone this has been very helpful so far. My over all goal with this car is to keep it well rounded, in the long run handling is very important to me and I want to kind of give it a road racing set up more so than drag racing. That being said I still want to be able to smoke camaroes and challengers from street lights so I guess 0-60 is more important than 1/4 mile. I've heard the 3.73 is the best set up for 0-60 and also motor trends M3 vs. Mustang GT comparo used a mustang with 3.73's and they posted nearly identical times.

mbreinin · February 7th, 2012, 10:54 AM

If you want to rule the street from light to light, do not even stop at Boardwalk...just pass go and load up some 4.10s or 4.30s....and some tires that hook.

Mike

zinc02GT · February 7th, 2012, 01:15 PM

Originally Posted by DarkKnight2012

Thanks everyone this has been very helpful so far. My over all goal with this car is to keep it well rounded, in the long run handling is very important to me and I want to kind of give it a road racing set up more so than drag racing. That being said I still want to be able to smoke camaroes and challengers from street lights so I guess 0-60 is more important than 1/4 mile. I've heard the 3.73 is the best set up for 0-60 and also motor trends M3 vs. Mustang GT comparo used a mustang with 3.73's and they posted nearly identical times.

For what it's worth, I have 3.73's and MT ET Streets 28" tall tire.

20-90 - YouTube

February 3rd, 2012, 02:06 AM	#1
DarkKnight2012 MOB 2012 Mustang GT Premium Join Date: Feb 2012 Location: North Carolina Posts: 21 iTrader: 0 reviews	3.31 swap for 3.73 or 4.10? First off, I'm new to the forum and I already know this topic has probably been discussed to death but, I have a 2012 manual GT with 3.31 gears and I've decided a gear swap would be the quickest way to get noticeable results and make sure camaroes aren't a problem. I had decided on 3.73s but the guy at the shop I'm getting the work done at suggested 4.10s. I had thought the 4.10s would be too aggressive for d/d but he seemed to think it would make no noticeable difference in drivability. I am mostly concerned with what this could potentially do to 1/4 et's and 0-60 since it will undoubtedly require an extra shift for each. Will the gained acceleration outweigh the time needed for the extra shift? Does anyone have any actual track times or any data for the kind of changes in mpg and theoretical top speed?

February 3rd, 2012, 12:39 PM	#7
pghdjspaz obsessed 2012 Mustang GT Join Date: Feb 2011 Location: Pittsburgh Posts: 339 iTrader: 0 reviews	The 3.73's are amazing but my cousin races his mustangs an highly suggests the 4.10's. I'm not sure of his times but his cars are insane. __________________ 2012 Mustang GT Premium Interior Black on Black Black Mustang Club Member Number: Spaz Look me up on FB: http://www.facebook.com/pghdjspaz

February 3rd, 2012, 02:04 PM	#8
Austin_ Regular 2012 5.0 Join Date: Nov 2011 Location: Parker co Posts: 307 iTrader: 0 reviews	Just throwing this out there, I've heard of two cars that went faster running a taller gear. From 3.73s to 3.55s the guy picked up a tenth or more and 3 mph in the quarter and another 10 second car that went from a 3.90 to a 3.55 and went faster as well. __________________

February 3rd, 2012, 02:37 PM	#12
Alejandro5.0 Regular 2012 gt 5.0 Join Date: Dec 2011 Location: Corpus Christi, Texas Posts: 172 iTrader: 0 reviews	3.73 __________________ 2012 Gt/Cs: steeda cold air, tune, 3.73 404whp 388torque

February 4th, 2012, 02:49 AM	#15
whitemach Regular Join Date: Jun 2011 Posts: 85 iTrader: 0 reviews	4.10s will slow you in the quarter,,,,,,,,,,,,,,,,,you cant make it with out going to 5th......i know i went from 4.10s to 3.73 and went faster!!!!!!!!! __________________ 2011 5.0 6mt 3.73upr sct tune steeda C/A OR X PIPE 432rwhp/372rwtq 11.74@118.48

February 3rd, 2012, 02:32 AM	#3
DarkKnight2012 MOB 2012 Mustang GT Premium Join Date: Feb 2012 Location: North Carolina Posts: 21 iTrader: 0 reviews	I know I'd probably be happy with 3.73s right now I guess my concern is I plan to go to bigger wheels down the road and wonder if that will make me wish I got 4.10s... I'm also very curious about how the shifting times up with 4.10's I guess I'm afraid I'll run out of gear to quick.

February 3rd, 2012, 02:57 AM	#5
DarkKnight2012 MOB 2012 Mustang GT Premium Join Date: Feb 2012 Location: North Carolina Posts: 21 iTrader: 0 reviews	Are you able to hit 60 in second?

February 4th, 2012, 09:34 AM	#16
MachWon Newbie Join Date: Jun 2007 Location: Ohio Posts: 20 iTrader: 0 reviews	I'm researching the same thing and here are some M6 3.73 geared theoreticals based on gear calculators that are available 27" tire = 114 mph at 7,000 rpms, 4th gear (OE tire diameter) 28" tire = 118 mph at 7,000 rpms, 4th gear Bumping the redline just 100-200 rpm raises the 28" tire-4th gear max to 120-121 mph __________________ 12 GT SG Brembos 73 Maverick

February 6th, 2012, 12:30 PM	#17
mbreinin Newbie Join Date: Jan 2012 Posts: 42 iTrader: 0 reviews	Shaun at AED went from 3.73s to 3.55s. With a 28 inch tire he picked up 2 tenths and 3 mph. He tunes my car. I run 3.31s with a 26 inch tire and Shaun recommended keeping it that way. I will be going to the track hopefully this Wednesday for some times with his tune. I just loaded it up yesterday. 3.55s are perfect for the track, although for street action (which is rarely a full 1/4), you may get better results from a deeper gear. Mike

February 6th, 2012, 11:46 PM	#18
DarkKnight2012 MOB 2012 Mustang GT Premium Join Date: Feb 2012 Location: North Carolina Posts: 21 iTrader: 0 reviews	Thanks everyone this has been very helpful so far. My over all goal with this car is to keep it well rounded, in the long run handling is very important to me and I want to kind of give it a road racing set up more so than drag racing. That being said I still want to be able to smoke camaroes and challengers from street lights so I guess 0-60 is more important than 1/4 mile. I've heard the 3.73 is the best set up for 0-60 and also motor trends M3 vs. Mustang GT comparo used a mustang with 3.73's and they posted nearly identical times.

February 7th, 2012, 10:54 AM	#19
mbreinin Newbie Join Date: Jan 2012 Posts: 42 iTrader: 0 reviews	If you want to rule the street from light to light, do not even stop at Boardwalk...just pass go and load up some 4.10s or 4.30s....and some tires that hook. Mike

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