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Differential gears

This is a discussion on Differential gears within the Drivetrain forums, part of the LSx Technical Help Section category; I've been looking at 4.10 and 3.73 ring and pinion change for my 2000 WS6. I've been told that by ...

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    Differential gears

    I've been looking at 4.10 and 3.73 ring and pinion change for my 2000 WS6. I've been told that by changing to one or the other that there would be a noticeable difference in performance. I've also been told that Pontiac installed the best combination for performance and the change isn't needed and won't make a bit of difference. Does anybody know what the WS6 came with to begin with and is it worth the expense to change it to 4.10 or 3.73?

    Thanks,

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    In before "omg...go 9" or 12-bolt...stocker will break under stock power"

    Stock Gearing = 3.42

    3.73s won't give you a real noticeable change, 4.10s will. You will need to get your computer reflashed so the Speedometer will read correctly.

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    Member c5z28's Avatar
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    if you have an a4 get 3.73 if you have an m6 then 4.10-atleast these are the most popular choices.

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    Senior Member INMY01TA's Avatar
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    Pontiac geared the car best for milaege and performance. As the others said, for an auto, go 3:73s. For a manual, go 4:10s.

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    Member cmb570's Avatar
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    didnt the berger and some other specialty camaros come with 4.10 and stock rear end ? Or did they upgrade the rearend ?

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    Member Fearls1's Avatar
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    Quote Originally Posted by ls1camino View Post
    In before "omg...go 9" or 12-bolt...stocker will break under stock power"

    Stock Gearing = 3.42

    3.73s won't give you a real noticeable change, 4.10s will. You will need to get your computer reflashed so the Speedometer will read correctly.
    The 10 bolt will not break under stock power, if you know how to drive. And 3.73 gears in a Six Speeder will make a difference. And still keep the rpm's low at 60. Out of my mods, the gears have made the most difference. Make sure to get a new carrier along with the ring and pinion.
    3" MagnaFlow CatBack w/Corsa (clone)Tips, Lloyds Custom Floor Mats, SLP Lid, Pro 5.0 W/ Lou's SS, 7.5" Eaton Locker w/3.73, KYB AGX, BMR LCA's, FRA, SSE, 5% Tint, 18x9 C5 Rims w/Falken 452

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by Fearls1 View Post
    The 10 bolt will not break under stock power, if you know how to drive. And 3.73 gears in a Six Speeder will make a difference. And still keep the rpm's low at 60. Out of my mods, the gears have made the most difference. Make sure to get a new carrier along with the ring and pinion.
    Give me one good reason to put 3:73s in a six speed instead of 4:10s..

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    What I do? SHines-IT's Avatar
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    Quote Originally Posted by INMY01TA View Post
    Give me one good reason to put 3:73s in a six speed instead of 4:10s..
    Quote Originally Posted by Fearls1 View Post
    And 3.73 gears in a Six Speeder will make a difference. And still keep the rpm's low at 60.
    Some of use daily drive our shit, so gas mileage is still nice.

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by SHines-IT View Post
    Some of use daily drive our shit, so gas mileage is still nice.
    When I went from 3:42s to 4:10s my gas milaege didn't drop even one whole mile per gallon. Not a good reason.

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    5 speeds did good all around with 3.73's and the way a 6 speed is geared 4.10's would be good preformance and still run a decent RPM down the highway. From 3.42 you will not loose but maybe a tenth or 2 to the mile per gallon ratio. If you had a 2.73 gear and did a lot of highway then changed to a 4.10 you would see about a half to a full mile lost but the differance between 3.42's and 4.10 is 0.68. guys change from 2.73's to 3.73's in auto's all the time and actually don't loose the millage because most drive around town and it helps thier millage.

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    my 6 speed worked great with 3.89's...luckily ford makes a gear right in between.

    def. go 4.10 though

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    As reference, in my M6 I went from 3.42 to 4.11 when I bought my 9" and the RPM at 70MPH went from 1500 to 1900.

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    Member cmb570's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    As reference, in my M6 I went from 3.42 to 4.11 when I bought my 9" and the RPM at 70MPH went from 1500 to 1900.
    how much of a difference did you feel

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by cmb570 View Post
    how much of a difference did you feel
    It feels like a night and day difference. The car really woke up.

    I also got LTs and a Y at the same time with a tune, so granted I added some HP too, but you can definitely "feel" the difference with the gearing change.

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