a4 4.10s. bad choice.
11-10-2009, 09:11 PM
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a4 4.10s. bad choice. so i put some 4.10s in my car to replace the 3.42s i had after the stock carrier blew into pieces and out the cover. well i do dd the car during the summer when its nice. well the 4.10s were a bad idea. it runs 2250 at 60mph. well that just on a 2 lane if i were to drive it on the interstate say goin 80 its well over 3k. i cant say im unhappy with the gears. this thing will move! when i can get traction! 
but as far as a trip car anymore i kicked that in the bag. anyone with 3.73s and an a4 car got and comments on how there car runs? think i should change to 3.73s?
but as far as a trip car anymore i kicked that in the bag. anyone with 3.73s and an a4 car got and comments on how there car runs? think i should change to 3.73s? 
11-10-2009, 09:18 PM
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4.10's are good for M6's sense they have a better gear ratio then a A4 as far as DD driving go.
you might want to go to 3.73's if your planning on DDing it.
My car is at the shop right now getting 4.10's installed but I am a M6...
you might want to go to 3.73's if your planning on DDing it.
My car is at the shop right now getting 4.10's installed but I am a M6...
11-10-2009, 09:44 PM
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haha i researched alot but just loved the way 4.10s drove. the thing is nasty from a roll or stopped either one. i was wanting to drive to florida this weekend and itll be hell on my ears and motor both so im not going to. but im looking to get ride of this thing anyway just havnt posted it yet. just thought id throw a feeler out there and see how many people bashed me for 4.10s in my a4 car. lol.i want a m6 car real bad now. but for anyone wanting first hand if you dd yout car and its and auto i wouldnt do 4.10s unless its at least a every weekend track car like mine. give a little to get a little i guess. thing is still fun as hell to drive!!!
11-10-2009, 10:41 PM
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haha i researched alot but just loved the way 4.10s drove. the thing is nasty from a roll or stopped either one. i was wanting to drive to florida this weekend and itll be hell on my ears and motor both so im not going to. but im looking to get ride of this thing anyway just havnt posted it yet. just thought id throw a feeler out there and see how many people bashed me for 4.10s in my a4 car. lol.i want a m6 car real bad now. but for anyone wanting first hand if you dd yout car and its and auto i wouldnt do 4.10s unless its at least a every weekend track car like mine. give a little to get a little i guess. thing is still fun as hell to drive!!!
Even with big 28" tall tires of the day, you were taching 3 g's at about 58mph. And drivin' all over God's creation too!
With your current setup at 2250 RPM, we would've thought we were in Hiway Cruisin' Heaven for sure!
I have 3.73's and a 3200 TCI. I drive 120 miles round trip to the local Track, run in the 11's on an under 75* day/nite, and drive it home. Not the fastest by any means, but I can drive it anywhere. Went on a 1200+ mile trip once and averaged 22 MPG and change tachin' at 2500-3 g's. (Around 80-85 mph)
3.73, is a good gear, especially with the 3.09 1st gear in the A4.
FYI Great formula for "torque multiplication:"
3.09 1st gear x 3.73 rear gear = 11.52. A great range is 9.5-10.5 on a Big Block street car (Torque), and 10.5-11.5 on a Smallblock (Higher RPM HP)
Anything higher w/Street Tires is totally undoable as the launch, or steppin' into it is even greater "Smoke City"......
Good Luck whatever you do.
Last edited by RapidRick; 11-10-2009 at 10:47 PM.
11-10-2009, 11:36 PM
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I started with 3.73s and loved them. Then ran 4.10s for a couple of months till I could no longer stand them and last week installed some 3.42s since i do alot of interstate driving. Im not touching the little 10 bolt anymore and when it breaks ill get a 12 bolt with 3.73s. Great all around gear.
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11-12-2009, 08:53 AM
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I went m6-a4 and kept my 4:10's wouldnt go for a higher gear in my street car.
You gotta decide which direction you wanna take your car. I wanted a radical street car and have built it accordingly.
You gotta decide which direction you wanna take your car. I wanted a radical street car and have built it accordingly.
11-12-2009, 01:56 PM
#9
Ahhh let me give you a different spin here.
When it comes to "RACING" these cars, on motor, no power added, and race weight is at a stockish level.
4.10's in a A4
&
4.30's in a m6
Is considered the ideal gear ratio for the 1/4 mile. Given the car has the needed tire/suspension set ups with a good rear and clutch, it will leave like it should. The racer should consider a 27 or even 28" tall tire for driving all the time.
This will do a few things.
- Larger Overall Diameter knocks down RPM at a given Transmission ratio
- Larger O/D gives more side wall for the needed flex to allow the tire to work
- Larger contact patch compared to a 26" tall tire and 4.10 gear.
- You get the TQ multiplcation but better flex and contact patch, and retain a sensible RPM when crusing.
Over all, its your car, you have to like it. 3.73's is considered the overall best for those who want more but do not want too wild or do alot of free way crusing. But I would see how the car is with 28" tall radials.
Just make sure your shift points are adjusted properly.
When it comes to "RACING" these cars, on motor, no power added, and race weight is at a stockish level.
4.10's in a A4
&
4.30's in a m6
Is considered the ideal gear ratio for the 1/4 mile. Given the car has the needed tire/suspension set ups with a good rear and clutch, it will leave like it should. The racer should consider a 27 or even 28" tall tire for driving all the time.
This will do a few things.
- Larger Overall Diameter knocks down RPM at a given Transmission ratio
- Larger O/D gives more side wall for the needed flex to allow the tire to work
- Larger contact patch compared to a 26" tall tire and 4.10 gear.
- You get the TQ multiplcation but better flex and contact patch, and retain a sensible RPM when crusing.
Over all, its your car, you have to like it. 3.73's is considered the overall best for those who want more but do not want too wild or do alot of free way crusing. But I would see how the car is with 28" tall radials.
Just make sure your shift points are adjusted properly.
11-14-2009, 07:23 AM
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I'm thinking about 3.90s for an A4. But, I'm afraid to touch my 10 bolt until I can get a 12 bolt or something stronger. I told my friend about 10 bolts being weak but he said I'm not making the power. Whatever...
Any opinions on 3.90 for an A4?
Any opinions on 3.90 for an A4?
11-14-2009, 09:42 AM
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haha this is true. in town its out of hand. i love it though. 
as far as 3.90 to 4.10 idk how big of a jump it will be. never been in an a4 with 3.90s. but if you do much highway or interstate and less racing id stay with 3.90. more dd friendly. and youll still notice a BIG diff between them and stock gears.
as far as 3.90 to 4.10 idk how big of a jump it will be. never been in an a4 with 3.90s. but if you do much highway or interstate and less racing id stay with 3.90. more dd friendly. and youll still notice a BIG diff between them and stock gears.
11-15-2009, 04:23 PM
#13
i read where chrs1313 went from stock 323s to 410s and gained nothing. he has a high ten sec cam only car. i'd think with a good converter you wouldn't notice a gear swap as much. my bolt on a4 car had 373s in it (273 factory car), it managed 24mpg and went 12.teens @ 111. turned about 2450 in od at 70 if i remember correctly. stock wheels and tires, trans, rear etc.
and i thought the 4l60e in these cars had a 3.06 first gear..not 3.09?
and i thought the 4l60e in these cars had a 3.06 first gear..not 3.09?
11-15-2009, 09:36 PM
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I just had 4.10's installed in my M6 SS..
with the MS3 cam, and 412rwhp, the 4.10's are NASTY. Burrys the speedo before you even take your eyes off the road to look down.
with the MS3 cam, and 412rwhp, the 4.10's are NASTY. Burrys the speedo before you even take your eyes off the road to look down.
11-16-2009, 08:18 PM
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I have a 9inch with 3.89 gears and a 4L65E trans in my LS Monte. When I'm cruising on the highway, my rpm's at 65 mph is about 2400-2450. If I take it out of overdrive, it will jump to 3500 rpm, perfect for a nice cam. I'm running 16's on my car. This should be very similar in an fbody. If I had to drive this every day, I wouldn't go more than 3.89 gears but what everybody finds streetable is subject to opinion. I have it paired with a 2800 stall vig although I might have to change it to something larger in the future. I hope this helps.
Last edited by SilverBullet73; 11-18-2009 at 07:41 PM.
11-16-2009, 10:03 PM
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Same deal here. I only gained right around a .1 - .15 in the 1/4 when going from 2.73 to 3.73 on the stock stall, but it made the car much more fun to drive on the street which is where it's at 99% of the time anyway. I do want to add a stall which should really wake the car up.