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New Gears..3:73 vs. 4:11

This is a discussion on New Gears..3:73 vs. 4:11 within the Manual Transmission forums, part of the Drivetrain category; Kinda curious as to which gear ratio that you guys prefer. My car is a daily driver so I dont ...

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    New Gears..3:73 vs. 4:11

    Kinda curious as to which gear ratio that you guys prefer. My car is a daily driver so I dont want my mpg to drop tremendously. My car has bolt on mods but nothing major and I dont really go to the track, just want a little more bottom end. So here are my questions.

    How many mpg am I going to lose with 3:73 and 4:11?

    What are some good gears other than Richmond, SLP, and Auburn?

    What am I looking to pay for the gears and to have them installed?
    Last edited by joliver2; 10-12-2008 at 07:39 PM. Reason: wrote 4:10 rather than 4:11

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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Lot of local KY guys use Motive, but they always end up blowing up the 10bolt and go for 9 inch or the 12 bolt. Give horsepower house a call. They are in bowling green.

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    Motive makes great gears, i have their 3.90s and love em

    its been a while but i think i paid 3xx to have them installed maybe 400 id have to look
    1999 Camaro SS/ Pewter/ #1775 - LS1 6-speed - Predator 3 Custom Tune - Pro 5.0 - LS7 Clutch - 3.90's - Koni's - Strano Springs and Sway Bars - SFC's - Full UMI Chassis and Suspension - LS6 Intake PnP TB - ARH LT's and Kitty Ran Away - Magnaflow.

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    Quote Originally Posted by JoshieDoom View Post
    Lot of local KY guys use Motive, but they always end up blowing up the 10bolt and go for 9 inch or the 12 bolt. Give horsepower house a call. They are in bowling green.
    I dont completely understand the whole "bolt" thing. What are our cars stock? I was thinking that they're 7.5 inch.

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    Senior Member Tyler_LS1's Avatar
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    Quote Originally Posted by joliver2 View Post
    I dont completely understand the whole "bolt" thing. What are our cars stock? I was thinking that they're 7.5 inch.

    Our gears are 7.5 inch The housing is a 10 bolt. the ford 9 inch has a 9 inch gear

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    79 T/A -91 Firebird
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    How much HP are you laying down?

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    Quote Originally Posted by JoshieDoom View Post
    How much HP are you laying down?
    I'm probably putting down like 400 at the crank. So I can order 3:73 gears that are 9 inch and 12 bolt (rather than 7.5 inch and 10 bolt which is stock) and it bolt up fine? Or in order to do that do I have to do a complete rear end swap?

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    Senior Member Tyler_LS1's Avatar
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    you have to do a complete rear end swap to a 12 bolt or a 9 inch

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    Quote Originally Posted by Tyler_LS1 View Post
    you have to do a complete rear end swap to a 12 bolt or a 9 inch
    Ok, that whats I thought. I know im looking at big money to do that so roughly how much?

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    Senior Member Tyler_LS1's Avatar
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    Quote Originally Posted by joliver2 View Post
    Ok, that whats I thought. I know im looking at big money to do that so roughly how much?
    depends on what you get,

    Moser 12 bolt from Texas Speed will run you $2150

    Moser 9 inch from Texas Speed will run you $2250

    That was just one site i looked at, the prices vary elsewhere.

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    Quote Originally Posted by Tyler_LS1 View Post
    Motive makes great gears, i have their 3.90s and love em

    its been a while but i think i paid 3xx to have them installed maybe 400 id have to look
    When you jumped up to 3:90s did you notice a big change in your gas mileage..I dont drive a whole lot of interstate. Mostly around town or back country roads running 55-60

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    Senior Member Tyler_LS1's Avatar
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    i get about 27mpg on the highway, before it was 30ish

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