Is there a good bit of improvement in acceleration going from 2.73 to 3.31 gears ??? - Mustang Evolution

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Old 07-09-2014, 07:11 PM   #1
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Exclamation Is there a good bit of improvement in acceleration going from 2.73 to 3.31 gears ???

Is there a good bit of difference in acceleration going from 2.73 to 3.31 gears?

Swapping from 2.73 to 3.31 the speedometer correction can be done at the dealer using their Ford IDS system and is not reflashing the vehicle with any non-stock or aftermarket tuning in the computer which saves the warranty. The car is brand new and I would like to preserve the warranty for now.


I'd love to go to 3.73 or 3.55 gears, but I am disinterested for now due to losing the warranty with aftermarket tuning or speedo correction if I use anything greater than 3.31.


Is there a good bit of improvement in acceleration going from 2.73 to 3.31 ??
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Old 07-09-2014, 08:02 PM   #2
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My dealer told me I would be disappointing for the cost of labor in the install on 3.31 . Instead they put in 3.55s and calibrated the computer to a ford factory 3.31 gear gear with very small tires to get the speedo very close on a stock tune. If you want to tune, you can get it exact. I was very pleased and it was like a real seat of the pants improvement, better improvement then the tunes.

I chose 3.55 over 3.77 as I drive rural hy-way on long trips, not the 60-65mph circle city highway, and good MPG at 75-85 was important.

on 3.77 you will need a tune.

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Old 07-09-2014, 08:14 PM   #3
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Thank you Art. Very good info!

Can you please check to see what tire size they chose to get the speedo close for the 3.55 gears?

When they selected 3.31 as the gear size, hopefully you can find out what size tire they selected please.

Many Thanks!
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Old 07-09-2014, 08:24 PM   #4
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I've been doing quite a bit of highway driving and with my 3.73s I've averaged 27mpg 80℅ highway, not bad at all! Its the city that I notice I'm taking a pretty big hit!

2013 3.7 Manual Candy apple red metallic,
GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.
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Old 07-09-2014, 08:41 PM   #5
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Originally Posted by GT 1 View Post
Thank you Art. Very good info!

Can you please check to see what tire size they chose to get the speedo close for the 3.55 gears?

When they selected 3.31 as the gear size, hopefully you can find out what size tire they selected please.

Many Thanks!
I have no way to go back to them and find out. The two techs drove in my past 2013 V6/Auto car. The one driving is in my mustang club, he told me the passenger is the gear master that installed my gear. He adjusted "revs per mile" using the ford stock computer calibrator, by trying tire size settings for small total diameter tires; until they could match my Escort 9500ix GPS mph reading as close as possible. [Any good gps should work] The Ford Gear Master Tech no longer works there, he moved on to better gear work early this spring.

BTW, get a good Ford Racing Axle cover with both fill and drain holes. If you need to add a little bit extra friction modifier later, it makes it a breeze For the little extra money since the stock cover must be removed, replace it with a more useful and good looking one. My Ford dealer gave me the cover at a super deal.

I currently have a 2013 V8/MT82 with the 3.31. I can tell the difference in gearing, but with the manual trans in the V8; I don't need the 3.55 gear to launch quick the V6 does.
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Old 07-09-2014, 08:52 PM   #6
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My 2014 V6 is a stick, I wonder if that makes much difference compared to your Auto?


I wonder if going to a 3.31 is much of an improvement over my 2.73 gears?
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Old 07-09-2014, 08:52 PM   #7
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Originally Posted by FastFord13 View Post
I've been doing quite a bit of highway driving and with my 3.73s I've averaged 27mpg 80℅ highway, not bad at all! Its the city that I notice I'm taking a pretty big hit .
Hi FastFord, what MPH speed are you calling Highway at 80% for 27mpg?
75-85? Heck I-95 down in FLA runs 85-90mph. Local city loops call freeways is not really hiway, its just 60 mph roads you don't stop on as much as the surface streets

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Old 07-09-2014, 08:55 PM   #8
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Art,

Do you have the Part Number for the Rear End Diff Cover with the fill and drain holes please?
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Old 07-09-2014, 08:58 PM   #9
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Lol, no no no, I'm doing 110 km, I guess that's around 65.

2013 3.7 Manual Candy apple red metallic,
GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.
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Old 07-09-2014, 09:04 PM   #10
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Lol, no no no, I'm doing 110 km, I guess that's around 65. .
Yea that makes a world of difference. Try 85mph out sometime for a short period of time and reset your MPG meter to see what it says?
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Old 07-09-2014, 09:06 PM   #11
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Art,

Do you have the Part Number for the Rear End Diff Cover with the fill and drain holes please?
This one Ford Racing M-4033-G2 - Ford Racing 8.8 Axle Girdle Covers
http://www.americanmuscle.com/frpp-88-diff-cover.html

Keep in mind not all Ford Dealers will work with you on such gear changes and extra work to calibrate it, or other mods like intakes; but many will especially if they sell Ford Racing Parts as mine does.

I later tuned the car, but was glad I had a factory tune I could put back in that would work ok with the gear.
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Old 07-09-2014, 09:08 PM   #12
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4 sure, our speed limit here Is 100km, I'll do 120 but that's pretty much it for me. I really wanted to see if it was still possible to get good mpgs at speeds just over the limit, glad its still possible with 3.73s.

2013 3.7 Manual Candy apple red metallic,
GT 500 stripes, painted side mirror covers, GT 500 spoiler, 2010 GT premium wheels with Pirelli P-zero tires, upper and lower front billet grille, Barton shifter bracket, Airaid Cold air intake, S.R lowering springs, J&M adjustable panhard bar, Boss 302 strut tower brace, 3.73 ford racing gears, Bama tuned, BBK shorty headers, Roush Axel backs.
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