Installing 3.73 on the 2011 GT Convertible? Pros? Cons? - Ford Mustang Forum
 
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post #1 of 12 (permalink) Old 07-05-2010 Thread Starter
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Installing 3.73 on the 2011 GT Convertible? Pros? Cons?

The convertible comes with 3:31, there was no option to upgrade to 3:55 or 3.73. Is anyone thinking about upgrading? What would be the cost, including the retune? What are the pros and cons?

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post #2 of 12 (permalink) Old 07-05-2010
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I was at a two day car show and cruise. When driving the 373s were pretty good at 30 mph. Ronn


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post #3 of 12 (permalink) Old 07-05-2010
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There have been many posts on the different gear choices and opinions as to their uses. Try to search for those and you will get much info on the subject. Since so much has already been written, there may not be many answers to your post..
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post #4 of 12 (permalink) Old 09-06-2013
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Chasis Flex with convertible

Hello, why did ford only put the 3.31 in the convertible. Was it due to fuel economy or will the 3.73 give the convertible more chasis flex?
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post #5 of 12 (permalink) Old 09-06-2013
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If your 3.31's are quiet without whine I'd keep them and get a Shaftmasters aluminum driveshaft and a Ford Racing Pro Cal tune (will preserve what warranty you have left). The Shaftmaster is worth .1-.2 in the quarter and the Procal is another .1-.2 for a total of around .4 in the quarter, about what you'd pick up with the gear change alone. The Pro Cal is a mild street "safe" tune that adds around 60 ft lbs of torque at 1500 rpm and about 12 hp. I've been kicking it around myself but have decided to wait; 420 hp is enough for me right now.....not that many Shelby's running around the "farming/country" that I live in. About the only thing around me is cows going MOO!

Ford gear changes are notorious for being noisy and can be a costly endeavour if not properly done the first time. For every Ford owner that has quiet gears on initial install, there are 2 or 3 that have problems. Ford OEM 3.73's are known to be noisy anyway.

Good luck!

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post #6 of 12 (permalink) Old 09-06-2013
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Quote:
Originally Posted by mattr12 View Post
The convertible comes with 3:31, there was no option to upgrade to 3:55 or 3.73. Is anyone thinking about upgrading? What would be the cost, including the retune? What are the pros and cons?
Actually the convertible comes with 3.15 differential gear ratio

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post #7 of 12 (permalink) Old 09-07-2013
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Quote:
Originally Posted by Radioguy View Post
Actually the convertible comes with 3.15 differential gear ratio
Actually the manual convertible only comes with 3.31's and no other gear options.
If you get the auto convertible it comes with 315's just like the coupe.

Assuming the OP has a manual:
I've done the swap and mild difference wasn't worth the money.

Upside:A little peppier from a roll and 6th more useable
Downside: possible rear end noise once there can't be fixed without another swap, extra shifting, 1st gear useless at full throttle, extra shift into 5th in the 1/4 mile, generally expensive to swap

If you are looking to go faster and more response get a good tune with X or H pipe.


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post #8 of 12 (permalink) Old 09-07-2013
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Quote:
Originally Posted by 5.0ben View Post
Actually the manual convertible only comes with 3.31's and no other gear options.
If you get the auto convertible it comes with 315's just like the coupe.

Assuming the OP has a manual:
I've done the swap and mild difference wasn't worth the money.

Upside:A little peppier from a roll and 6th more useable
Downside: possible rear end noise once there can't be fixed without another swap, extra shifting, 1st gear useless at full throttle, extra shift into 5th in the 1/4 mile, generally expensive to swap

If you are looking to go faster and more response get a good tune with X or H pipe.
Sorry, I misread the post and thought it was a vert auto.

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post #9 of 12 (permalink) Old 09-07-2013
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Going from 3:15's to 3:73's will definitely give you more responsive acceleration in all gears. You might lose some fuel mileage at highway speeds, but there is no free lunch.
As for cost, look at the price of the gears and related parts and count on 4-6 hours of labour to install. Good luck.

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Quote:
Originally Posted by mattr12 View Post
The convertible comes with 3:31, there was no option to upgrade to 3:55 or 3.73. Is anyone thinking about upgrading? What would be the cost, including the retune? What are the pros and cons?
I have a 2011 vert and I even contacted Brenspeed about the upgrade. Just not worth the cost in my opinion. The quote I got for labor and gears was just slightly cheaper than an aluminum driveshaft.
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I have 3.73's and have been considering 3.55's for fuel mileage. I drive 80 miles roundtrip to work and have averaged 19.5-20 on the highway. I just got the procal tune from ford racing and am now averaging 22.0 mpg! Woo Hoo! I would love to get 24-25 since 91 octane is 3.80 in kansas. I've learned to skip shifts in town to avoid 5 gear changes to 35 mph.

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Quote:
Originally Posted by randeez11 View Post
Going from 3:15's to 3:73's will definitely give you more responsive acceleration in all gears.
He said he had 3.31's not 3.15's.

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