4:10 gears
Team Owner
Joined: Jul 2004
Posts: 24,652
Likes: 298
From: NJ
St. Jude Donor '05-'08
not sure about the breakage. I would think on stock tires with TC on you would not see any more problems than the stock 3.42s. I would add the harden shaft though when you do the change just to add extra insurance.
I have had mine for about 5 months or so with about 40 1/4 mile passes on them without any problem (I am sure now that I said that something will happen).
My guess though is if you use 4.10 gears with DRs and drop the clutch at 6K rpm and everything hooks up well then something will have to give.
If you want another side I have heard of shaft of stock gears (3.42s) breaking at the track with street tires.
The bottom line is if you are racing your car something will eventually break. If you run your car on the street and drive it hard there is less chance of breakage, but still a chance. If you drive your car very conservatively - well then trade it in for a Euro car....
BTW - I love my 4.10s. The car comes alive with them. Though people say you shift more I find many times I shift less because 4th gear can be used in town with no reason to downshift or upshift. Through some nice twisty roads I also can leave the car in 3rd and have some fun with it.
I have had mine for about 5 months or so with about 40 1/4 mile passes on them without any problem (I am sure now that I said that something will happen).
My guess though is if you use 4.10 gears with DRs and drop the clutch at 6K rpm and everything hooks up well then something will have to give.
If you want another side I have heard of shaft of stock gears (3.42s) breaking at the track with street tires.
The bottom line is if you are racing your car something will eventually break. If you run your car on the street and drive it hard there is less chance of breakage, but still a chance. If you drive your car very conservatively - well then trade it in for a Euro car....
BTW - I love my 4.10s. The car comes alive with them. Though people say you shift more I find many times I shift less because 4th gear can be used in town with no reason to downshift or upshift. Through some nice twisty roads I also can leave the car in 3rd and have some fun with it.
Last edited by Wicked Weasel; Jun 8, 2005 at 09:41 AM.
Pro
Joined: Apr 2005
Posts: 620
Likes: 0
From: Los Angeles CA
Fascinating thread! 
I have been planning a switch from my A4's 2:73's (Granny gears!) to 3:42's....then I was thinking I may as well go 3:73. Is this too much of an upgrade for my stock A4?
And is it even viable for me to consider the 4:10 (isnt there a 3:9-something too?)? I dont think thats very likely for me, but if Im gonna switch them gears out from stock....I wonder what the best ratio option is to get the most bang for my buck? Without killing all the connecting hardware?
Mine is just a daily driver, but in my mind Im a racecar driver when nobody's looking. Heck, thats what I bought it for!
Thanks!~~~JadeDragon
I have been planning a switch from my A4's 2:73's (Granny gears!) to 3:42's....then I was thinking I may as well go 3:73. Is this too much of an upgrade for my stock A4?
And is it even viable for me to consider the 4:10 (isnt there a 3:9-something too?)? I dont think thats very likely for me, but if Im gonna switch them gears out from stock....I wonder what the best ratio option is to get the most bang for my buck? Without killing all the connecting hardware?
Mine is just a daily driver, but in my mind Im a racecar driver when nobody's looking. Heck, thats what I bought it for!
Thanks!~~~JadeDragon
Race Director
Joined: Sep 2003
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From: Now in God's Country, the Big Sky, Montana!
Cruise-In 7-8-9-10 Veteran
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
I have a M6 so I am running 4.10s but from what I've read, you don't want to go higher than a 3.73 with the A4.
Le Mans Master
Joined: Sep 2004
Posts: 7,978
Likes: 1,854
From: North/Central NJ - a.k.a. Gotti in the CFNE section
St. Jude Donor '05
Originally Posted by Cajundude
I have a M6 so I am running 4.10s but from what I've read, you don't want to go higher than a 3.73 with the A4.
.. haven't even really seen people with a close to stock a4 going higher than 3.73.. I wouldn't if it was me..
Former Vendor
Joined: Aug 2004
Posts: 1,027
Likes: 1
From: Tampa Florida
I had a customer in California who installed the 3.73's in his A4 with most of the basic bolt on's and he LOVED it!
I would not put a higher stall converter in unless you plan to drag race. for normal driving and just getting on it once in a while you don't need it and you will have a much harder time getting traction with the stock tires with the high stall converter.
goos luck!
I would not put a higher stall converter in unless you plan to drag race. for normal driving and just getting on it once in a while you don't need it and you will have a much harder time getting traction with the stock tires with the high stall converter.
goos luck!
Cherish your Hopes...
Joined: Feb 2002
Posts: 13,074
Likes: 236
From: West Palm Beach FL
Cruise-In VII Veteran
St. Jude Donor '05-'06-'07
Originally Posted by Todd@EastCoastCorvettes
I had a customer in California who installed the 3.73's in his A4 with most of the basic bolt on's and he LOVED it!
I would not put a higher stall converter in unless you plan to drag race. for normal driving and just getting on it once in a while you don't need it and you will have a much harder time getting traction with the stock tires with the high stall converter.
goos luck!
I would not put a higher stall converter in unless you plan to drag race. for normal driving and just getting on it once in a while you don't need it and you will have a much harder time getting traction with the stock tires with the high stall converter.
goos luck!
Intermediate
Joined: May 2005
Posts: 47
Likes: 0
From: Racine WI
great thread! I have been looking at 410s as my next mod for a while now. I think im sold now. Where is the best place to buy the gears? And what should you expect for a top speed with these gears and a slighty modded 6-speed.. i.e. vararam, LT's w/ full exhaust, ls6 intake.
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Safety Car
Joined: Jun 2004
Posts: 4,769
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From: Lovin Life Oh
ok maybe im wrong on this but i would think there would be less stress on things in front of the gears and more stress on things after the gears the higher you go
heres why
say you slam 400ft lbs into a 2.73
the transmission will turn 2.73 times for every time you tunr the axle
thats alot more resisitance than if you can turn tranmission 4.11 times per wheel revolution
it would have to deal with leverage
i deffinately see axles snapping far more often because of the increased torque being applied per wheel revolution
but you already replaced the stock output shafts with the hardened ones that can take it so i would argue there is less breakage infront of the gears because of a lesser load
so in short replace the output shafts for 300$ do both not just 1 (rear right)
i think i recall them being around 150 a piece
heres why
say you slam 400ft lbs into a 2.73
the transmission will turn 2.73 times for every time you tunr the axle
thats alot more resisitance than if you can turn tranmission 4.11 times per wheel revolution
it would have to deal with leverage
i deffinately see axles snapping far more often because of the increased torque being applied per wheel revolution
but you already replaced the stock output shafts with the hardened ones that can take it so i would argue there is less breakage infront of the gears because of a lesser load
so in short replace the output shafts for 300$ do both not just 1 (rear right)
i think i recall them being around 150 a piece
Le Mans Master
Joined: Feb 2002
Posts: 5,407
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From: HONOLULU HAWAII
Originally Posted by JTizzle
great thread! I have been looking at 410s as my next mod for a while now. I think im sold now. Where is the best place to buy the gears? And what should you expect for a top speed with these gears and a slighty modded 6-speed.. i.e. vararam, LT's w/ full exhaust, ls6 intake.
http://www.dynotech-eng.com/
Race Director
Joined: Mar 2004
Posts: 12,634
Likes: 15
From: IL, Chicago area.
St. Jude Donor '14-'15-'16
I have had my DTE 4.10 rearend in my car for about 5 weeks now......it's great. I have noticed no change in my gas milage (unless I am exercising the new gears heavily 
) and the acceleration is awesome.
Andy at A&A was my final decision maker. I spoke to him on the phone and he told me a car with an MN6 trans and 4.10's is about the same as a Z06 with the 3.42's.
) and the acceleration is awesome. Andy at A&A was my final decision maker. I spoke to him on the phone and he told me a car with an MN6 trans and 4.10's is about the same as a Z06 with the 3.42's.
Team Owner
Joined: Feb 2001
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Cruise-In II Veteran
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19
Originally Posted by PHPD7102
Andy at A&A was my final decision maker. I spoke to him on the phone and he told me a car with an MN6 trans and 4.10's is about the same as a Z06 with the 3.42's.
