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Old 08-01-2014, 05:12 PM   #1
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Questions regarding 3.73s and Tune

Hey guys, I've got a 2012 3.7 Mustang M6 with GT500 axlebacks. I am looking to upgrade to 3.73 gears to replace the sluggish 2.73s but I'm concerned about a couple of things.

I'm pretty much set on getting a Steeda tune, but do I need to get another tuner? My dad has a SCT X3 tuner for his mustang but he took it off. I was wondering if it's possible to use it with my car if I bought Steeda's lifetime tunes off their website.

Also can I just do the gears only? I see that some people get a whole new differential. I only have 24k miles on my car.

And one last thing, will an OEM driveshaft from a 11-14 5.0 bolt up to the 3.7 and be able to work till 150 mph or whatever the 5.0 is limited to? I want to replace the drive shaft later on but I don't want to spend $700 on an aluminum one.

I'm new to this kind of stuff so any info or advice is appreciated.
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Old 08-01-2014, 05:23 PM   #2
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Tuner: as long as your dad returned his mustang to stock to unmarry it, you are fine to reuse it and purchase custom tunes for your mustang.


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Old 08-02-2014, 05:21 AM   #3
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Just get the gears and the install kit, no need to change the differential.


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Old 08-02-2014, 09:20 AM   #4
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Quote:
Originally Posted by 3.7batmobile View Post
Hey guys, I've got a 2012 3.7 Mustang M6 with GT500 axlebacks. I am looking to upgrade to 3.73 gears to replace the sluggish 2.73s but I'm concerned about a couple of things.

I'm pretty much set on getting a Steeda tune, but do I need to get another tuner? My dad has a SCT X3 tuner for his mustang but he took it off. I was wondering if it's possible to use it with my car if I bought Steeda's lifetime tunes off their website.

Also can I just do the gears only? I see that some people get a whole new differential. I only have 24k miles on my car.

And one last thing, will an OEM driveshaft from a 11-14 5.0 bolt up to the 3.7 and be able to work till 150 mph or whatever the 5.0 is limited to? I want to replace the drive shaft later on but I don't want to spend $700 on an aluminum one.

I'm new to this kind of stuff so any info or advice is appreciated.
A 5.0 drive shaft will NOT fit on our 3.7. Its a different length and no can do bro. You can use your dads tuner but it must be unmarried to your dads mustang and then your good to go.

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Old 08-02-2014, 12:32 PM   #5
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Thanks for the response guys. I'll be ordering them and getting them installed in a couple of weeks.
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Old 08-02-2014, 05:28 PM   #6
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Good move on the 3.73s with the automatic. Keep the same tire diameter. The driveshaft you mentioned is longer as stated and has a different pinion flange with a different bolt circle. V6 uses the flat plate type and the V8 uses the coupling type with the larger bolt circle. One is 3 3/4 and the other is 4 1/4. Easy change out. Call Steeda with your needs. Be informed.
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Old 08-02-2014, 06:35 PM   #7
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My car is a manual. I see a lot of guys revving their 3.7s to 7250 rpm, is this safe? I'm not sure if it will do 60 mph in second gear with 3.73s at 7k rpm. I know its probably a stupid concern but I want it to hit 60 in second. lol
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Old 08-03-2014, 01:58 PM   #8
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My car shuts the fuel off well before 7250. Besides the max HP and Torque numbers are well below that number and it doesn't get the car down the track any quicker I assure you. I had an LT1 Camaro covered really well when the fuel shut off on a missed 3rd gear shift one night. He ran 14.30 and I cover that with 14.0s all night long with my stocker.
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