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3.73 gears done

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Old 12-22-2011, 10:17 PM   #1
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Default 3.73 gears done

I have two Mustangs a 2001 GT with too many mods to list: 420hp and 404tq, and a 2012 base M6 V6. My '01 has 3.73 gears. I had my tuner install 3.73 FRPP gears on my V6. They are whisper quiet and make a huge difference to the car. Power in every gear at every rpm, with a loss of about 3 mpg city. I seem to remember someone on this thread saying 3.73's were to low for this car. They could not be more wrong. These were the gears that were meant to be on this car. This should be your first mod. I have a sct3 tuner for the speedo correction and I will probably just do light bolt-ons for this car becasue this is my winter car. I currently have the 87 octane Bama street tune on the car and winter tires on stock rims. I got a deal on a set of 2012 GT take-off 19" rims with tires for $700 (2500 miles) for the summer. They are the ones painted black on the inside and brushed aluminum on the outside "spokes". I think I went off on a tangent. Anyways, if you are thiking about gears, get 3.73's and have them installed by a pro. You will not regret it.
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Old 12-23-2011, 07:39 AM   #2
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Is the 2012 V6 an automatic? What tires are you running this winter?
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Old 12-23-2011, 12:03 PM   #3
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When someone types M6 V6, the M6 means manual 6 speed. I am running Mastercraft Glacier Grip II, 215/60/17 M+S. They are almost the exact same height as the summer wheels and tires I am putting on in the summer 245/45/19 Pirelli's. I got them at Belle Tire for like $500.
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Old 12-23-2011, 12:26 PM   #4
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So how does the V6 with the gears compare to the 2001 GT? Just curious.
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Old 12-23-2011, 05:41 PM   #5
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I have an appointment next Friday to get my 3.73s too. Really looking forward to it.
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Old 12-28-2011, 09:52 PM   #6
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So how does the V6 with the gears compare to the 2001 GT? Just curious.
Well, pretty similar, minus the power of course. Sometimes, you have to feather first when starting off (which you get used to) but all the other gears are just so much more usable. I love rowing a shifter but the 2.73 gears were ridiculous. Now there is power in most gears at most rpms. Just really transforms the car.
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Old 12-28-2011, 10:13 PM   #7
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I got 3.73s with my '12, and I love them. I have less than 75 miles on my car, the best 75 miles of my life. An absolute perfect compromise between regular gears and 4.11s.
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Old 12-29-2011, 09:00 AM   #8
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You guys are killing me. I wish my car could go under the knife a day earlier.
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Old 12-29-2011, 09:20 AM   #9
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Quote:
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You guys are killing me. I wish my car could go under the knife a day earlier.

I know what you mean, seems like everyone is getting gears!
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Old 12-29-2011, 10:17 AM   #10
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Mine has an appointment for tomorrow, it was the earliest I could get. But they do the most Mustang gear swaps in the state and are highly recommended, so I figured i should wait.
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Old 12-29-2011, 10:31 AM   #11
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I had mine done 2 weeks ago. Well worth it. Here's the link to my gear thread in case you haven't seen it.

http://mustangforums.com/forum/4-0l-...-lok-pics.html
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Old 12-29-2011, 10:33 AM   #12
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Mine has an appointment for tomorrow, it was the earliest I could get. But they do the most Mustang gear swaps in the state and are highly recommended, so I figured i should wait.
Get ready to have some fun with the upgrade. You will love it.
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Old 12-29-2011, 12:24 PM   #13
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I haven't really hit on the car much, but from a u-turn yesterday, I'm 90% confident that the power of the gears will let 1st spin from pedal in any speed. Second seems to be a little more refined, almost between a "normal" gear ratio and a low gear.
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Old 12-30-2011, 05:51 PM   #14
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Faaaaawk! Got the gears installed along with J&M LCAs this morning. 3.73 gears should be part of the Performance Package or maybe even an upspec option of that package from the factory. I love how the car responds, I wish I did this sooner. With hindsight being 20/20, 3.73 gears should have probably been my first mod. That's how significant the change is to me. Worth every penny of the $489 I paid.
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Old 12-30-2011, 05:59 PM   #15
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And for anyone wanting a speed/rpm calculator, this one is the most accurate:
http://goo.gl/nWlbo

I used Fatboyraceworks, but it always tended to undercalculate what the RPM would be for a given speed.
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Old 12-31-2011, 03:44 PM   #16
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I'm convinced the worst thing about the gear change process is that break in process. It's painfully to stay off of it for those first few hundred miles
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Old 01-01-2012, 09:47 AM   #17
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I'm convinced the worst thing about the gear change process is that break in process. It's painfully to stay off of it for those first few hundred miles
huh? I've never heard that before.
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Old 01-01-2012, 10:19 AM   #18
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huh? I've never heard that before.
ya, you want to avoid wot runs for a while. i know its hard to do. you want to make short runs letting the gears warm up then cool down. i did that for the first day, but then had to run on the highway to work the next, mine have been fine. then you want to change the gear oil around 500 miles.
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Old 01-01-2012, 10:24 AM   #19
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huh? I've never heard that before.
My installers, (http://www.ringpinion.com/ outside of Seattle) who do nothing but gear work, were pretty insistent on it. You can find all sorts of resources online about it. A break in period generally consists of letting the rear cool down after the first 20 miles driven. Then no heat generating actions (long sustained trips, or hard accelleration), for the first 200 to 400 miles. Changing the gear oil right after the break in period is also recommended.

http://www.teamrip.com/transfer_case...roceedure.html
http://www.reiderracing.com/rtech-break.php
http://www.californiamotorsports.net...break%20in.pdf
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Old 01-01-2012, 04:50 PM   #20
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Quote:
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I'm convinced the worst thing about the gear change process is that break in process. It's painfully to stay off of it for those first few hundred miles
Never heard of the long break in period. Have had half a dozen gear changes on cars and break in period has been going easy for about a dozen miles. Also, never heard of changing the oil at 500 miles. I have never had ANY problems with gears over long periods of owning them. My tuners has also done thousands of gear changes.
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Old 01-01-2012, 04:50 PM
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