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Old 01-09-2017, 03:11 PM   #1
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Automatic Converter Versus New Gears or Both?

I have read on the internet that a automatic transmission converter would provide better low end torque and hence better starting acceleration versus replacing the OEM rear gears with say a 3.73 set up. Wanted to get real world experience feedback. Also, would it be a waste of money to do both or can/should you do both? As always, thanks for your time and feedback.
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Old 01-09-2017, 03:36 PM   #2
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On the GT doing a gear swap on the stock converter is useless, on the 3.7 however, a gear change is very useful.

Now, obviously doing both will help, because i dont think you're going to get under a 2.0 60' on the stock converter, try as you might. We had 3.73 gears on our auto v6 and i could stage that thing up to 2500 rpms and dead hook... 2.0 60' lol.
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Old 01-09-2017, 04:36 PM   #3
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Voltwings thanks for the initial reply. Related questions - a local drive train shop asked me about a rear posi in addition to the rear gear swap. What are your thoughts on adding such?
Will it cause issues with the VSC?
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Old 01-09-2017, 07:18 PM   #4
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Voltwings thanks for the initial reply. Related questions - a local drive train shop asked me about a rear posi in addition to the rear gear swap. What are your thoughts on adding such?
Will it cause issues with the VSC?

Your car has posi from the factory. If they don't know that, they probably don't have much experience installing gears in our cars. You might want to look around a little more.


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Old 01-09-2017, 07:46 PM   #5
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Your car has posi from the factory.
I thought they typically just had a limited slip from the factory. If the shop suggested a "posi" they might have been asking about an actual locking differential, such as a Torsen or Detroit locker.

If it were my choice and I had the money for it, I would prefer a gear type locker (Torsen) over a stock spring loaded clutch limited slip, but that is just a personal preference.
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Old 01-09-2017, 08:37 PM   #6
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I thought they typically just had a limited slip from the factory. If the shop suggested a "posi" they might have been asking about an actual locking differential, such as a Torsen or Detroit locker.



If it were my choice and I had the money for it, I would prefer a gear type locker (Torsen) over a stock spring loaded clutch limited slip, but that is just a personal preference.

Limited Slip, Posi, Sure-Grip...all refer to the same thing. Detroit Locker is a different animal. I don't think most people think of a locked axle as Posi.


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Old 01-09-2017, 09:02 PM   #7
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Very true. I just mentioned it because I have heard a lot of people use "posi" and "locker" interchangeably over the years, sometimes even guys that should know the difference. I usually ask for clarification if it is in a situation where it matters. Like you mentioned, a limited slip and a locker are two different things, and act differently in certain situations.
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Old 01-09-2017, 10:09 PM   #8
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The local shop is recommending a locking differential in addition to the 3.73 rear gear swap. As for pricing they use Ford Racing Performance Gears and ask $677 for parts and labor with a two year 100K mile warranty. For the locking differential they ask an additional $350 with the same type of warranty. Much less than any other shop in the Denver CO area. I do not plan on racing or dragging with my stang since it is only a V6 I am just looking for the most performance gain I can get without installing a supercharger.
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Old 01-09-2017, 10:17 PM   #9
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Automatic Converter Versus New Gears or Both?

Quote:
Originally Posted by rgwest61 View Post
The local shop is recommending a locking differential in addition to the 3.73 rear gear swap. As for pricing they use Ford Racing Performance Gears and ask $677 for parts and labor with a two year 100K mile warranty. For the locking differential they ask an additional $350 with the same type of warranty. Much less than any other shop in the Denver CO area. I do not plan on racing or dragging with my stang since it is only a V6 I am just looking for the most performance gain I can get without installing a supercharger.

Anyone know how streetable the modern lockers are? Based on the Op's plan for using the car, I'm thinking he should just get the gears and be done with it. Don't forget the tune to adjust for them.

2 year 100k warranty? Sounds more like a 2 year warranty. Most people don't put 50k on per year.


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Old 01-09-2017, 10:24 PM   #10
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Thanks for your replies. As for a tune I already purchased a Bama tuner earlier this year. I have not contacted Bama yet for my first tune - how soon after the gear swap does the new tune need to be installed.
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Old 01-10-2017, 05:55 AM   #11
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Thanks for your replies. As for a tune I already purchased a Bama tuner earlier this year. I have not contacted Bama yet for my first tune - how soon after the gear swap does the new tune need to be installed.
Soon as you change the gears because your speedometer will be off 'If' your tunes are like mine, you can change the gear ratio (and a few other things) when you load the tune to your Mustang
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Old 01-10-2017, 06:35 AM   #12
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If you arent drag racing the factory diff is fine. Hell, even if you were... They're just trying to upsell you.
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Old 01-10-2017, 01:03 PM   #13
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If you wouldn't mind, whats the shops name? I'm looking to have my gears swapped as well. That price/warranty sounds decent.
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Old 01-10-2017, 01:25 PM   #14
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Are you still thinking about getting a stall converter? How high are you going to go? You need to make sure that the rpm on the stall converter does not make 1st gear good for only 10 feet or so.
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