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Question on gears

This is a discussion on Question on gears within the Drivetrain forums, part of the LSx Technical Help Section category; Ok i'd like to put a set of 3.73's or a set of 4.10's in my 01 but do i ...

  1. #1
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    Question on gears

    Ok i'd like to put a set of 3.73's or a set of 4.10's in my 01 but do i have to tune for them to make sure the speed o will read right?

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    Member TA98's Avatar
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    you dont have to. but if you dont your speedometer will be off and that messes up your odometer and you will be racking up more miles than youre actually driving

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    Member importhater81's Avatar
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    Are you an a4 or m6?. a4's require tuning after a gear change to shift properly.

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    megs 02sunsetorangeZ's Avatar
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    i think he is an a4, his name is 01a4z28 lol

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    Assuming you're an A4,which gears do you currently have,2.73s' (GU2) or 3.23s' (GU5) ?
    what part of Ohio are you in ?

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    If it's an auto. 3"42 or 3'73s
    00 ss blk m6 " STOCK" strano springs, slp bilstein shocks, adj LCA, adj panhard bar, relocation brackets, 2 point SFCs welded,OEM zo6 rims black, magnaflow exhaust, CME exhaust,E/cutout, slp grille, custom front plate mount, HIDs, whistler mod, side moldings delete, slp air lid, ported and polished TB, strut tower brace, 3.73s gears, and some other parts to list!
    next to come,4.10s,ls7 clutch, ms3 or 228r cam, ported 243s, ls6 intake, ls6 oil pump. ls2 timing chain, longtube headers no cats, with a tune..
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    Senior Member TLS_Addict's Avatar
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    Quote Originally Posted by importhater81 View Post
    Are you an a4 or m6?. a4's require tuning after a gear change to shift properly.
    I was told you dont need to have a tune to get it to shift properly, only the speedo will be off. That is from a tuning "expert".

    Can I ask where you got that information from? I am not calling you out or anything just curious.

    Quote Originally Posted by 98maro View Post
    If it's an auto. 3"42 or 3'73s
    Good call. I just got a set of 3.73s.

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    A4 cars have MPH based shift points I believe. A large enough gear change could affect this.

    Probably affects the TC lockup also?

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    Senior Member TLS_Addict's Avatar
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    Good info 35th.

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    what are you looking for your car ? people get so scared with autos and gears...if you are doing drag strip ..dont be afraid of 4.xx ..my lord we have a order drive gear ...if you are on the street look into 3.73 to 4.10

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    I have 4.10's in my auto street car. I can daily drive it without issue....I run about 2600 rpm at 70 on the highway.

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    Senior Member TLS_Addict's Avatar
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    Only thing that scares me of the gear change is that some people break the rears out. I dont think I am pushing any huge amount of power I just wanted a little extra for the street and the 2 or 3 times a year I plan to go to the drag strip.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by TLS_Addict View Post
    Only thing that scares me of the gear change is that some people break the rears out. I dont think I am pushing any huge amount of power I just wanted a little extra for the street and the 2 or 3 times a year I plan to go to the drag strip.
    true but remember autos preload the drivetrain so the shock is so much less than a m6

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    from a 3.73 to a 4.10 is only about 10% more torque "increase"

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    Member importhater81's Avatar
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    Quote Originally Posted by TLS_Addict View Post
    I was told you dont need to have a tune to get it to shift properly, only the speedo will be off. That is from a tuning "expert".

    Can I ask where you got that information from? I am not calling you out or anything just curious.
    I went from a 3.23 to a 4.10 in my own a4 car. Due to the different speed to rpm ratio a gear change will bring,a tune is a must in a a4. I'm no "expert tuner" by anymeans. I speak from my own experience.
    Last edited by importhater81; 02-20-2011 at 06:10 AM.

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    Senior Member TLS_Addict's Avatar
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    Sorry for the late response!

    Quote Originally Posted by shady milkman View Post
    true but remember autos preload the drivetrain so the shock is so much less than a m6
    Very true, less "shock" at launch. I have a stock converter so I will try to just leave around 1600-1700 like last time.........unless my car breaks loose earlier which it might do...lol

    Where do you start to get that chawing when you are braking it and hitting the gas?

    Quote Originally Posted by importhater81 View Post
    I went from a 3.23 to a 4.10 in my own a4 car. Due to the different speed to rpm ratio a gear change will bring,a tune is a must in a a4. I'm no "expert tuner" by anymeans. I speak from my own experience.
    No doubt. I am going from 2.73 to 3.73 and YES I am getting a re-tuned pcm to compensate for it. I feel it necessary.....I want a correct speedo and no issues what so ever.

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    Quote Originally Posted by oldmanZ28 View Post
    Assuming you're an A4,which gears do you currently have,2.73s' (GU2) or 3.23s' (GU5) ?
    what part of Ohio are you in ?
    i do currently have 2.73's, i was leaning more towards 4.10's i road in my buddies car and was sold on them and his is also an a4.

    i am from marietta

  18. #18
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by TLS_Addict View Post
    Very true, less "shock" at launch. I have a stock converter so I will try to just leave around 1600-1700 like last time.........unless my car breaks loose earlier which it might do...lol

    Where do you start to get that chawing when you are braking it and hitting the gas?



    No doubt. I am going from 2.73 to 3.73 and YES I am getting a re-tuned pcm to compensate for it. I feel it necessary.....I want a correct speedo and no issues what so ever.
    chawing ?

  19. #19
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    since you're 2.73s' which has a 2 series carrier,you'll need a 'thick' set of gears,unless you get a 3 series carrier (from a 3.23 or 3.42 rearend).
    I'm 4.56s' in an A4 and spinning 2500rpm at 60mph,changing your ratio from 2.73s' will give you
    -1775 rpm @ 60mph with 3.23s'
    -1875 rpm @ 60mph with 3.42s'
    -2000 rpm @ 60mph with 3.73s'
    -2250 rpm @ 60mph with 4.10s'

    you will need a 'tune' to correct speedometer and shift points,but not the type of 'tune' that is associated with a dyno tune,just find someone that has a laptop tuner with 'open' license.
    changing from 2.73s' to 3.23s'/3.42s' would be much cheaper/simpler by just swapping in a complete 'take-out' rearend. If that were the case you would need to make sure you got a 'channel compatable' rearend. You didn't state if you're 3 channel ABS or 4 channel ABS & Traction Control.
    Most will upgrade their convertor first(before gears) for perfomance.

  20. #20
    Senior Member TLS_Addict's Avatar
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    Quote Originally Posted by shady milkman View Post
    chawing ?
    Where you are not moving but your rear tires start spinning.

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