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Rear Gear Upgrade Opinions

This is a discussion on Rear Gear Upgrade Opinions within the Drivetrain forums, part of the LSx Technical Help Section category; Currently I have a 1998 Firebird A4 with 3.42 gears in it currently. The StreetFighter Torque Converter(about a 3,000 to ...

  1. #1
    11 Second Club 11.34 bigboykilroy's Avatar
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    Rear Gear Upgrade Opinions

    Currently I have a 1998 Firebird A4 with 3.42 gears in it currently.
    The StreetFighter Torque Converter(about a 3,000 to 3,500 rpm stall speed) and trans Go shift kit will be installed over the winter, but want to upgrade the gears next week and want a base line of the car before the conv and shift kit get installed. Going in a A4 with 3.42 in it to 3.73 or 3.90.
    The car is driven around town and on the freeway for fun. What gears do people recomend that have an A4 that has upgraded have to say.
    Last edited by bigboykilroy; 09-24-2007 at 12:57 PM.

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    Senior Member clg82's Avatar
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    Quote Originally Posted by bigboykilroy View Post
    Currently I have a 1998 Firebird A4 with 3.24 gears in it currently.
    The StreetFighter Torque Converter(about a 3,000 to 3,500 rpm stall speed) and trans Go shift kit will be installed over the winter, but want to upgrade the gears next week and want a base line of the car before the conv and shift kit get installed. Going in a A4 with 3.42 in it to 3.73 or 3.90.
    The car is driven around town and on the freeway for fun. What gears do people recomend that have an A4 that has upgraded have to say.
    +1 to this, i am STILL trying to decide between 3.73 and 3.90.....someone help us!!!
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

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    11 Second Club 11.34 bigboykilroy's Avatar
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    Red face

    Since no one wants to seem to help us, how about you install one size and ill install the other, and we will compare !!

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    Senior Member clg82's Avatar
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    Quote Originally Posted by bigboykilroy View Post
    Since no one wants to seem to help us, how about you install one size and ill install the other, and we will compare !!
    ........lets keep waiting for help

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    Senior Member 35thAnniZ28's Avatar
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    hehe...from what i read on ls1.com... people usually go for 3:73s on autos...4:10s for stick.....

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    11 Second Club 11.34 bigboykilroy's Avatar
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    I have seen that too, but the people that are asking the same question as us are not posting what grear they ended up going with and what the results were.

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    Impounded
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    Well i had 3.73s in my formula, that had 2.73s, i felt a big difference, but if you want to do freeway racing, i have a friend with a 94 z28 auto with 3.42s and he says he love them.

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    Senior Member clg82's Avatar
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    Quote Originally Posted by 2000T/A Guru View Post
    Well i had 3.73s in my formula, that had 2.73s, i felt a big difference, but if you want to do freeway racing, i have a friend with a 94 z28 auto with 3.42s and he says he love them.
    thats good you felt a difference going from 2.73 to 3.73 but i have 3.23 and i don't want to go 3.73 if i'm not gonna feel much of a difference!!! someone help me with this insanity!!! Will i notice a difference going from 3.23 to 3.73 or should i just go 3.90?!?!?!?

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    Impounded
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    Obviously you will notice a difference, however goin 3.90s with a a4 is just stupid unless its a track only car, at like 60mph you wil lbe at like 3000rpms.

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    Rice Killa JwMonE99's Avatar
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    What exactly is the difference between 3.73, 3.90, and 3.43? What are the advantages and disadvantages of each?

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    11 Second Club 11.34 bigboykilroy's Avatar
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    Well I have decided to put this question to the test.
    I just purchased a set of 3.90 gears for my 1998 Firebird A4 that currently has 3.42 gears in it.(yes I know the A4's didnt come with a 3.42 but my car is a v6 to ls1 conversion)
    My engine/trans guy has donated his time to help us get some numbers on this often asked question.
    I should be getting the gears this friday afternoon, I will be running the car on Sat, I will post up the before and after numbers along with the HP tuneres log file (for the People who have it)
    I Will keep you all Posted !!
    Last edited by bigboykilroy; 09-24-2007 at 05:16 PM.

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    Rice Killa JwMonE99's Avatar
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    Nice man, I dont see many people go with the V6 to LS1 conversation. So how was it? Can't wait to get some results on the car.

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    11 Second Club 11.34 bigboykilroy's Avatar
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    it was an awsome experience, i would do it again in a heart beat. I bought the car when i was 18, could not afford ins on a v8 at 18, so i got the w68 (V6 ver of the WS6) So after it was paid off, decided since the car was with me all this time and it never had a prob, it was time to reward her with a mighty ls1 v8. I know i could have bought a v8 now in life but she was so good to me and i knew her history. So what the hell I went for it. All in total the upgrade/swap was about $4000.00. But also included Upgrades - MAC Headers, No Cats, Magna Flow Wide open Exhaust, Alum Drive Shaft, and the HP Tuners Software.
    Last edited by bigboykilroy; 09-24-2007 at 05:19 PM.

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    Senior Member 35thAnniZ28's Avatar
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    thats badass

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    BlackDevil BlackDevil's Avatar
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    cool

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    Senior Member clg82's Avatar
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    2000 Trans Am

    Quote Originally Posted by bigboykilroy View Post
    Well I have decided to put this question to the test.
    I just purchased a set of 3.90 gears for my 1998 Firebird A4 that currently has 3.42 gears in it.(yes I know the A4's didnt come with a 3.42 but my car is a v6 to ls1 conversion)
    My engine/trans guy has donated his time to help us get some numbers on this often asked question.
    I should be getting the gears this friday afternoon, I will be running the car on Sat, I will post up the before and after numbers along with the HP tuneres log file (for the People who have it)
    I Will keep you all Posted !!
    hey buddy let us know how the gear swap goes!

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    11 Second Club 11.34 bigboykilroy's Avatar
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    OK did a drive on the freeway today just crusing in OD, just as you would taking a "Sunday Drive" on the flat straight freeway. Here is the speeds and RPM on my car with a stock converter, and the 3.42 rear end and 26 inch tall tires.

    50 MPH - 1550 RPM
    55 MPH - 1700 RPM
    60 MPH - 1850 RPM
    65 MPH - 2000 RPM
    70 MPH - 2150 RPM
    75 MPH - 2300 RPM
    80 MPH - 2450 RPM
    85 MPH - 2650 PRM
    90 MPH - 2800 RPM

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    Senior Member clg82's Avatar
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    Quote Originally Posted by bigboykilroy View Post
    OK did a drive on the freeway today just crusing in OD, just as you would taking a "Sunday Drive" on the flat straight freeway. Here is the speeds and RPM on my car with a stock converter, and the 3.42 rear end and 26 inch tall tires.

    50 MPH - 1550 RPM
    55 MPH - 1700 RPM
    60 MPH - 1850 RPM
    65 MPH - 2000 RPM
    70 MPH - 2150 RPM
    75 MPH - 2300 RPM
    80 MPH - 2450 RPM
    85 MPH - 2650 PRM
    90 MPH - 2800 RPM
    so how did it turn out with the 3.90 gears was it worth it? and do you still have traction on the street when taking off at a launch?

  19. #19
    11 Second Club 11.34 bigboykilroy's Avatar
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    I have not put the 3.90 gears in yet, They should be here on friday. The above posting is a baseline with the 3.42 gears. I will post another 50 - 90 speed vs RPM once we install the gears over the weekend. Then I will also post my track times before and after as well.

  20. #20
    11 Second Club 11.34 bigboykilroy's Avatar
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    Got the new gears today, Hopefully I will get a change to install them over the weekend. I will post up the new Drive Around town results soon.

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