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Old 09-03-2012, 09:20 PM   #1
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Question About Gear Changes

I have a 2013 Mustang GT Automatic, and I wanted to change my gears from the stock 3.15 to 3.73 and I have several questions.

Now, Lethal Performance has "Ford Racing 8.8" 3.73 Gears" for 169.95 USD. Of course, I will have to bring it a shop to have it installed. I was wondering, besides buying that kit and having it installed, am I missing anything? I have already talked to the shop and they have the stuff to recalibrate the speedometer and odometer. Do I need a new tune for the car? These are the things that I am worrying about.
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Old 09-03-2012, 09:28 PM   #2
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Yes, computer will need to be recalibrated for new gears, either by tuner or by dealer, also make sure you have new gear oil and gasket. How many miles on your car?
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Old 09-03-2012, 09:49 PM   #3
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Re: Question About Gear Changes

Almost 4100 miles.
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Old 09-04-2012, 06:31 AM   #4
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Yea that should be good
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Old 09-04-2012, 09:04 AM   #5
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Re: Question About Gear Changes

Would you let the shop do the gear oil and gasket, or would you suggest that I purchase my own? If so, what is good gear oil and a gasket to get? Is that all I should be worried about?
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Old 09-04-2012, 09:37 AM   #6
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Let them do the gasket... Gear oil get royal purple, amsoil, or redline
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Old 09-04-2012, 10:10 AM   #7
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Re: Question About Gear Changes

Thank You for answering. So, before I get these gears changed, would it be wise to just order a custom tune from Brenspeed or whoever and have them go ahead and make it for the 3.73 gears? This way, before any major driving is done, the computer has been corrected for the new gears.
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Old 09-04-2012, 10:19 AM   #8
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Quote:
Originally Posted by helloWorld
Thank You for answering. So, before I get these gears changed, would it be wise to just order a custom tune from Brenspeed or whoever and have them go ahead and make it for the 3.73 gears? This way, before any major driving is done, the computer has been corrected for the new gears.
A custom tune in the auto alone will make the Auto instantly more fun.... No more throttle response delays or downshift delays when giving it more gas.

Combine that with the gears, man that will fly. Get some sticky tires!!!

Sounds like it won't matter, but just remember, Ford will point to the tune/gear change as the cause should anything break at some point.
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Old 09-04-2012, 11:58 AM   #9
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You'll be going through the gears a lot faster. The auto is geared really low in the first place. I think I'm already in 3rd or 4th at like 20ish mph sometimes.
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Old 09-04-2012, 03:32 PM   #10
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Re: Question About Gear Changes

should go with 4.10's for auto
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Old 09-04-2012, 07:26 PM   #11
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Re: Question About Gear Changes

This is a daily driver. It also happens to be the only car that I have. I think the 3.73 gears are a good middle ground, since that is the highest the manuals can get from the factory anyways, and that is what most youtube races have, manuals with 3.73 gears.

What do you guys think?
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Old 09-04-2012, 07:31 PM   #12
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Re: Question About Gear Changes

Quote:
Originally Posted by helloWorld View Post
This is a daily driver. It also happens to be the only car that I have. I think the 3.73 gears are a good middle ground, since that is the highest the manuals can get from the factory anyways, and that is what most youtube races have, manuals with 3.73 gears.

What do you guys think?
I think you made a wise choice. I'm going to order 3.73's for my manual when I'm done being a baby about risking my warranty from a tune lol
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Old 09-04-2012, 07:35 PM   #13
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Re: Question About Gear Changes

mine is strictly a daily driver I have 4.10's manual and its really not as bad as people think...its actually easier to drive on a daily basis and people have increased their mph with 4.10's and the seat of your pants feel when you tromp on it and go thru the gears is AMAZING!! I just drove from florida to vermont and got 22 mph on Interstate and i wasnt babying it..
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