3.15 to 3.55 worth it
#2
If you want a noticeable difference.. id think 3.73s would be ideal. I cant speak for a 12 auto, but with my 07 auto (totally different), the 3.73s made the car fun again. With my 11 manual, the 3.73s make first a little brief.. but second is a monster.. and fifth.. 60-100 in a heartbeat.
#6
Not much of a noticeable difference. Ford put 3.15's in the autos because they have 4.17's as a first gear in the tranny. A tune would make a night and day difference but you stated you won't be doing that.
#7
you'll have to send your PCM to ford if you don't tune it, the charge a butt load for it, i got a quote for $800 on my '07, unless something changed since then.
noticable? maybe a bit... for optimal 1/4 mile times you want either 3.31s or something beyond 4.10s.
I like my gears, my gas mileage went down the crapper but they are fun
I had a guy do mine that had done other people's and did a good job. Ask around at local places who has done gear swaps on 05+ mustangs and is satisfied there is no whine.
noticable? maybe a bit... for optimal 1/4 mile times you want either 3.31s or something beyond 4.10s.
I like my gears, my gas mileage went down the crapper but they are fun
I had a guy do mine that had done other people's and did a good job. Ask around at local places who has done gear swaps on 05+ mustangs and is satisfied there is no whine.
#8
I did not know I needed a tune for a gear swap. In that case I may consider a tune, I'm just a little hesitant because of some of the issues I've read about with aftermarket tunes.
But the increased performance I would definitely welcome.
Mishri what's your combined gas mileage with 4.10s?
But the increased performance I would definitely welcome.
Mishri what's your combined gas mileage with 4.10s?
#9
KIA Sorento 3.5L V6:
1st 4.651
2nd 2.831
3rd 1.842
4th 1.386
5th 1.000
6th 0.772
Final drive 3.195:1
Mustang:
1st 4.17
2nd 2.34
3rd 1.52
4th 1.14
5th 0.87
6th 0.69
Final drive 3.15:1
As you can see, the gear ratios for my wife's KIA are much more favorable for acceleration than my Mustang GT 5.0. But KIA can run those because they Sorento uses a smaller 3.5L v6 to our 5.0L v8 and so they can get good acceleration out of a heavy vehicle and still have good MPG.
Sorry for the long post, but it goes back to my opinion that Ford used a 3.15:1 rear end ratio for better MPG. And yes, hell yes I think 3.55 gear would make a nice difference in acceleration and make the Mustang feel lighter and take off faster off the line IF you can get it to hook up!
3.73 might be a bit much. Would not go 4.10 with the auto for sure.
Last edited by SilverHoss; 06-21-2012 at 10:53 AM. Reason: messed up wording
#10
IMO Ford put 3.15 in these cars to try and get a better MPG out of these cars, not because of the tranny gearing. Reason I say this, my wife's KIA Sorento seems to accelerate easier at light throttle, especially off a dead start than my GT Mustang ! I wondered why, so I looked up the specs, and the KIA uses higher ratios in the auto tranny than the Mustang. Check this out:
KIA Sorento 3.5L V6:
1st 4.651
2nd 2.831
3rd 1.842
4th 1.386
5th 1.000
6th 0.772
Final drive 3.195:1
Mustang:
1st 4.17
2nd 2.34
3rd 1.52
4th 1.14
5th 0.87
6th 0.69
Final drive 3.15:1
As you can see, the gear ratios for my wife's KIA are much more favorable for acceleration than my Mustang GT 5.0. But KIA can run those because they Sorento uses a smaller 3.5L v6 to our 5.0L v8 and so they can get good acceleration out of a heavy vehicle and still have good MPG.
Sorry for the long post, but it goes back to my opinion that Ford used a 3.15:1 rear end ratio for better MPG. And yes, hell yes I think 3.55 gear would make a nice difference in acceleration and make the Mustang feel lighter and take off faster off the line IF you can get it to hook up!
3.73 might be a bit much. Would not go 4.10 with the auto for sure.
KIA Sorento 3.5L V6:
1st 4.651
2nd 2.831
3rd 1.842
4th 1.386
5th 1.000
6th 0.772
Final drive 3.195:1
Mustang:
1st 4.17
2nd 2.34
3rd 1.52
4th 1.14
5th 0.87
6th 0.69
Final drive 3.15:1
As you can see, the gear ratios for my wife's KIA are much more favorable for acceleration than my Mustang GT 5.0. But KIA can run those because they Sorento uses a smaller 3.5L v6 to our 5.0L v8 and so they can get good acceleration out of a heavy vehicle and still have good MPG.
Sorry for the long post, but it goes back to my opinion that Ford used a 3.15:1 rear end ratio for better MPG. And yes, hell yes I think 3.55 gear would make a nice difference in acceleration and make the Mustang feel lighter and take off faster off the line IF you can get it to hook up!
3.73 might be a bit much. Would not go 4.10 with the auto for sure.