Thoughts on 3.73 gears..?
6/4/13, 05:46 PM
#22
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6/4/13, 08:55 PM
#23
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3.73's are perfect for an M6 unless you plan on going FI down the road, in which case you'd be wasting a lot of torque converting 93 octane into tire smoke.
6/5/13, 04:01 PM
#25
I have the 4.10's with a 26.4" tire and it literally has me shifting into 4th and 5th right at the stripe.
Last edited by db2797; 6/5/13 at 04:03 PM.
6/5/13, 05:04 PM
#26
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To add on to this, ideally you'd probably want a 28" tire with the 4.10's on an auto too. That will put you at about 94 MPH in the 1/8th and 125 in the 1/4. So it should keep you in 3rd in the 1/8th and 4th in the 1/4 and be deep in the powerband with a little bit of wiggle room going through the traps on both length tracks.
I have the 4.10's with a 26.4" tire and it literally has me shifting into 4th and 5th right at the stripe.
I have the 4.10's with a 26.4" tire and it literally has me shifting into 4th and 5th right at the stripe.
6/5/13, 06:22 PM
#27
with 4.10's and a 28" tire you'll be shifting into 4th at about 94mph.
With no mods, you should be able to hit about 109-110 MPH in the 1/4. With bolt ons, you can do between 114-118. Which means worst case scenario you'll be crossing the stripe at about 6100 RPM's which is well into the powerband. It's a myth that you "don't want to shift". There's nothing wrong with shifting as long as you're pulling hard in the powerband when crossing the stripe. The lower gear will give an advantage at the starting line especially if on the stock torque convertor.
The 3.31's will have you at shifting at about 118MPH. In which case if you were looking to have no wiggle room going across the stripe I would suggest my setup is actually better with 4.10's and the 26.4" tire which has you going across the stripe at the peak of 4th gear at 118MPH. I have less weight in my tires and a higher torque multiplier with the lower gear. I gained about 2/10ths of a second moving down to 4.10's from my stock 3.15's
Last edited by db2797; 6/5/13 at 06:26 PM.
6/6/13, 04:07 AM
#28
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You're not going to shift into 4th right before the stripe.
with 4.10's and a 28" tire you'll be shifting into 4th at about 94mph.
With no mods, you should be able to hit about 109-110 MPH in the 1/4. With bolt ons, you can do between 114-118. Which means worst case scenario you'll be crossing the stripe at about 6100 RPM's which is well into the powerband. It's a myth that you "don't want to shift". There's nothing wrong with shifting as long as you're pulling hard in the powerband when crossing the stripe. The lower gear will give an advantage at the starting line especially if on the stock torque convertor.
The 3.31's will have you at shifting at about 118MPH. In which case if you were looking to have no wiggle room going across the stripe I would suggest my setup is actually better with 4.10's and the 26.4" tire which has you going across the stripe at the peak of 4th gear at 118MPH. I have less weight in my tires and a higher torque multiplier with the lower gear. I gained about 2/10ths of a second moving down to 4.10's from my stock 3.15's
with 4.10's and a 28" tire you'll be shifting into 4th at about 94mph.
With no mods, you should be able to hit about 109-110 MPH in the 1/4. With bolt ons, you can do between 114-118. Which means worst case scenario you'll be crossing the stripe at about 6100 RPM's which is well into the powerband. It's a myth that you "don't want to shift". There's nothing wrong with shifting as long as you're pulling hard in the powerband when crossing the stripe. The lower gear will give an advantage at the starting line especially if on the stock torque convertor.
The 3.31's will have you at shifting at about 118MPH. In which case if you were looking to have no wiggle room going across the stripe I would suggest my setup is actually better with 4.10's and the 26.4" tire which has you going across the stripe at the peak of 4th gear at 118MPH. I have less weight in my tires and a higher torque multiplier with the lower gear. I gained about 2/10ths of a second moving down to 4.10's from my stock 3.15's
6/6/13, 04:53 AM
#29
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Like I recommend to everyone, know what your goals are first, otherwise you might as well just throw your money in the wind, and then you could be hunting for a different gear again if you don't like the change, which is just more dollars down the drain.
You have mods, but where do you use your Mustang?
-Daily Driver
-Drag Strip
-Road Course/Track Days
What percentage of your driving is on the city vs highway?
-Do you commute
-How many miles do you drive per day
-Is fuel mileage important
Do you enjoy shifting gears, or do you skip shift even with your 3.31's? I ask, because if you go to 3.73's+, you will find yourself skip-shifting more often.
Do you have wider than stock tires? If not, what are you going to do about traction? If you still have stock tires, 3.73's+ will cause more tire spinning at lower speeds. To take advantage of the gearing, you'll need more grip.
Does anyone else drive your car? If so, they might not be too happy having to shift more often and at lower speeds.
When I had my 2011 5.0 6MT, it came with factory optioned 3.73's, and at first the car blew my mind, revving through those gears so fast, I was elated. After approx 10k miles I grew tired of the constant shifting, and started comparing the gearing of the MT82 with different axle ratio's with max mph per gear, and ended up switching to 3.08's. Many though it was an odd choice, but it worked better for how and where I drove the car.
Do some research, think hard about your goals for the car, and in the end you will make a better decision.
You have mods, but where do you use your Mustang?
-Daily Driver
-Drag Strip
-Road Course/Track Days
What percentage of your driving is on the city vs highway?
-Do you commute
-How many miles do you drive per day
-Is fuel mileage important
Do you enjoy shifting gears, or do you skip shift even with your 3.31's? I ask, because if you go to 3.73's+, you will find yourself skip-shifting more often.
Do you have wider than stock tires? If not, what are you going to do about traction? If you still have stock tires, 3.73's+ will cause more tire spinning at lower speeds. To take advantage of the gearing, you'll need more grip.
Does anyone else drive your car? If so, they might not be too happy having to shift more often and at lower speeds.
When I had my 2011 5.0 6MT, it came with factory optioned 3.73's, and at first the car blew my mind, revving through those gears so fast, I was elated. After approx 10k miles I grew tired of the constant shifting, and started comparing the gearing of the MT82 with different axle ratio's with max mph per gear, and ended up switching to 3.08's. Many though it was an odd choice, but it worked better for how and where I drove the car.
Do some research, think hard about your goals for the car, and in the end you will make a better decision.
6/6/13, 09:02 PM
#30
I can definitely understand that not everybody wants that extra shift. For me, I have no issues with traction (anymore I should say). On an AT, only launching with slight pressure on the stall (I think around 1800 RPM's, I'm going to try and datalog this weekend to see where I'm launching consistently at), and since I've switched over to 305 MT Street Radials, I've hadn't had any traction issues in about 25 passes with this setup. No wheel spin at all.
6/7/13, 01:31 PM
#31
Bullitt Member
If you can live with losing 2-3mpg I'd say go for it. If you want to keep getting decent mileage, stick with 3.31s.
6/7/13, 01:49 PM
#32
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I average 19-21 with my track pack. With normal driving, some stop and go, along with some spirited driving. 3.73's arnt that bad.
6/7/13, 07:30 PM
#33
Shelby GT350 Member
Anyone who says they think 3.31's are perfect or a better choice has not had a 5.0 with 3.31's!! Trust me, 3.31's are the most anemic gear for this car... I test drove 3 2013's before buying mine, all with 3.73's. Those carsfelt so fast and got me hooked on mustangs. I found my GT in another state and thought the 3.31's would be fine and there wouldn't be a noticeable difference. Boy you shouldve seen the disappointment on my face when I first opened this car up!! Felt like a turd compared to the ones I test drove. I'm going with 3.73's and came across this thread. About to start a new topic regarding the tune required to correct the speedo...
But anyway, thats my 2 cents
But anyway, thats my 2 cents
6/7/13, 08:21 PM
#34
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Anyone who says they think 3.31's are perfect or a better choice has not had a 5.0 with 3.31's!! Trust me, 3.31's are the most anemic gear for this car... I test drove 3 2013's before buying mine, all with 3.73's. Those carsfelt so fast and got me hooked on mustangs. I found my GT in another state and thought the 3.31's would be fine and there wouldn't be a noticeable difference. Boy you shouldve seen the disappointment on my face when I first opened this car up!! Felt like a turd compared to the ones I test drove. I'm going with 3.73's and came across this thread. About to start a new topic regarding the tune required to correct the speedo...
But anyway, thats my 2 cents
But anyway, thats my 2 cents
6/8/13, 01:49 PM
#35
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6/9/13, 04:01 PM
#36
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3:73 vs 3:31
Bought a '13 GT MT-82 w/ 3:73s and couldn't stand them...I live in a really small college town with tons of stop-and-stop traffic. The 3:73s were killing me. 1st gear is so low that I got to the point where I was going to leave the car in 2nd gear from a stop. I got lucky when the car deal fell through after I drove it for 1000 miles. The dealer sold me a car that didn't meet emissions standard--but that's another story. I gave the car back to the dealer and picked up another '13 GT with the "axle promo package--a $995 discount" which I thought was going to be infamously "dog-slow." Not at all...for a DD the 3:31s are great. I can now run up the RPMs from 1-2 while in town and most of the time I'm in the 2-3 range vs the 3-4 range. The 3:31 is definitely the way to go if you do lots of city driving--they're simply way more suited for the street. Now if you're primarily on the track...
6/9/13, 04:09 PM
#37
Bullitt Member
I get 20-21.5mpg with my 3.73s & boss manifold
6/9/13, 05:39 PM
#38
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My 2011 Gt with 6 speed and upgraded Vortech blower has 3.73 gears. I could probably drop down to 2.73 and still plenty of fun. If you are the type that likes to easily torch the tires, then 3.73 are gonna make you smile. You will still know down 22-24 mpg on the hwy...
6/9/13, 08:00 PM
#39
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6/9/13, 09:26 PM
#40
Shelby GT350 Member
the 1st gear seemed fine in all the 3.73 cars I test drove...not sure what u guys are talking about. These 3.31's are such a let down. Maybe I got a slow car from the factory lol