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Old 11-10-2013, 03:07 PM   #1
kovacsr15
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Question 373 vs stock gears

Just bought a 2004 Mustang GT 4.6 , automatic , the motor is fully stock except for the cold air intake. I'm thinking of changing my stock gears to 373/410 would I gain anything? Called a few shops and was told that I was wasting my time , Any thought? I m trying to get faster acceleration w/out hesitation. For now it is not a every day driver I have a warranty on the trans/motor Any suggestions?
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Old 11-10-2013, 03:13 PM   #2
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Originally Posted by kovacsr15 View Post
Just bought a 2004 Mustang GT 4.6 , automatic , the motor is fully stock except for the cold air intake. I'm thinking of changing my stock gears to 373/410 would I gain anything? Called a few shops and was told that I was wasting my time , Any thought? I m trying to get faster acceleration w/out hesitation. For now it is not a every day driver I have a warranty on the trans/motor Any suggestions?
gears make a HUGE difference. If you want pure acceleration, 410s are the way to go. if you want acceleration and still some cruising rpms on the highway go with 373s. Either way its a crazy difference over stock, i dont know why a shop would tell you that.
You dont gain horsepower by the way, it just adds to your accel..

As far as warranty, the shop would have to prove your gears caused the failure for them to have a case.
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Old 11-10-2013, 03:33 PM   #3
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thanks for the imput. this is my first Mustang and don't want to blow my bank out
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Old 11-10-2013, 03:43 PM   #4
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right... a good gear kit with the install kit AND tuner is about 600. which isnt bad for what youll get. would you install yourself or no?
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Old 11-10-2013, 03:44 PM   #5
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Wrong forum. You're in the 2005-2014 forum.

A lot depends on what your current "stock" gears are. On the S197's, they could have come with 3.31, 3.55 or 3.73, depending on year, model and options. Not sure about the '04's...

Last edited by Nuke; 11-10-2013 at 03:46 PM.
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Old 11-10-2013, 03:52 PM   #6
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i believe 04's came with 3.27s out rear
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Old 11-11-2013, 05:39 AM   #7
kovacsr15
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Default 2004 mustang

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right... a good gear kit with the install kit AND tuner is about 600. which isnt bad for what youll get. would you install yourself or no?
thanks for the tip.i am thinking about taking it to lee myles or aamco for the install.do I really need a tune after the install?
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Old 11-11-2013, 05:55 AM   #8
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well if you want your speedometer to be correct then yes! any handheld tuner can do it. let us know what gears you decide on.
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Old 11-14-2013, 01:38 AM   #9
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the other section of the forum would help you out a little more im sure. this is 05+ years here. But I do know it will help for sure! No idea why a shop would say it wouldnt.?
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Old 11-21-2013, 02:21 PM   #10
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I would be very careful as to whom you take it to, it is a bear to get all the shims in correctly and everything lined up. Also, when you do it make sure you use Royal Purple and/or some friction modifier otherwise you will get noise on slow turns.

I have 4.10's and they are fantastic - love the difference. I have a 5-speed through (1st is now granny gear lol) and I think 3.73's are probably better for your automatic.
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