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Gears

This is a discussion on Gears within the Drivetrain forums, part of the LSx Technical Help Section category; Originally Posted by seth_12 dang all this gears stuff confuses me i still gotta decide if im gonna get 373 ...

  1. #21
    Moderator Cutlass's Avatar
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    Quote Originally Posted by seth_12 View Post
    dang all this gears stuff confuses me i still gotta decide if im gonna get 373 or 391 but the guy that's doing my rear end told me that there is not really a big difference between 342 and 373
    Doesn't really matter if the difference is big or not. The only thing that really matters is whats right for you and your car. If 342 isn't enough, then the usual auto trans recommendation is 373. 411 is generally considered too much for an auto. 391 isn't too far off from a 411 so it may be "too much" for you. You can play it sorta safe and do the 373 that everyone else does and know that it'll work well or you can go up to the 391 see how you like it.

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    Junior Member seth_12's Avatar
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    Quote Originally Posted by Cutlass View Post
    Doesn't really matter if the difference is big or not. The only thing that really matters is whats right for you and your car. If 342 isn't enough, then the usual auto trans recommendation is 373. 411 is generally considered too much for an auto. 391 isn't too far off from a 411 so it may be "too much" for you. You can play it sorta safe and do the 373 that everyone else does and know that it'll work well or you can go up to the 391 see how you like it.
    that is very true...i mainly thought about getting 391 bc im scared if i get 373 and it doesn't make a difference than that's money gone to waste but i was also told that 391 and 411 are good in a auto transmission on a take off bc an auto transmission doesnt have has much torque as a manual transmission so less chances of breaking or tearing something up

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    Senior Member Z28Thunder's Avatar
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    Quote Originally Posted by seth_12 View Post
    Did you ever had to cali. your speedometer when you put 373's in the rear end?
    I have a local tunner that does my tunning. He did adjust the speedometer cali as you say, as I added the mods. Car would not run the times it does and idle without his help.

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    Junior Member seth_12's Avatar
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    thats what i need to do when i get done putting the gears in my car it needs to be tuned for all the stuff i put on it since i got it

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    Member joedude02's Avatar
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    Quote Originally Posted by seth_12 View Post
    dang all this gears stuff confuses me i still gotta decide if im gonna get 373 or 391 but the guy that's doing my rear end told me that there is not really a big difference between 342 and 373
    just my .02. i'd keep the 3.42's. the gear changing is only gonna get you to your desired MPH in the shortest amount of time, that makes you faster on the short game (60' times) but you'll just fall flat on your face at the end of the 1/4. depending on your set up or future plans, just let the horsepower build get you the speed you're looking for. i actually have 3.73's in my 10 bolt but swapping a moser 12 in next weekend w/ 3.55's. i'll be able to shoot from home hard and all the way through my pass and never run out of gear. i'm currently "nosing over" a few feet before the end of my pass. my opinion-- big gears are for the 60'ers or serious racing enthusiast.

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    Quote Originally Posted by seth_12 View Post
    dang all this gears stuff confuses me i still gotta decide if im gonna get 373 or 391 but the guy that's doing my rear end told me that there is not really a big difference between 342 and 373
    Were the gears changed from 3:23 to 3:42 at 1 point if not 3:73 is what everybody is doing 4:11's you will be screamiung at top speed and looose it to

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    Quote Originally Posted by seth_12 View Post
    that is very true...i mainly thought about getting 391 bc im scared if i get 373 and it doesn't make a difference than that's money gone to waste but i was also told that 391 and 411 are good in a auto transmission on a take off bc an auto transmission doesnt have has much torque as a manual transmission so less chances of breaking or tearing something up

    IMO any $$$$$$ spent on a 10 bolt other than fluid changes is a waste...... Put that money aside and start saving for a 12 bolt with 3.73's or 3.90's

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    BLKHWK Durango's Avatar
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    Quote Originally Posted by joedude02 View Post
    just my .02. i'd keep the 3.42's. the gear changing is only gonna get you to your desired MPH in the shortest amount of time, that makes you faster on the short game (60' times) but you'll just fall flat on your face at the end of the 1/4. depending on your set up or future plans, just let the horsepower build get you the speed you're looking for. i actually have 3.73's in my 10 bolt but swapping a moser 12 in next weekend w/ 3.55's. i'll be able to shoot from home hard and all the way through my pass and never run out of gear. i'm currently "nosing over" a few feet before the end of my pass. my opinion-- big gears are for the 60'ers or serious racing enthusiast.

    I can't believe that you are slower with 3"73 frst time I hear that. I have 3:23 changing to 3:73 and I'm beeing tols 145mph before it starts doing what you are saying in an a4

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    Quote Originally Posted by Durango View Post
    I can't believe that you are slower with 3"73 frst time I hear that. I have 3:23 changing to 3:73 and I'm beeing tols 145mph before it starts doing what you are saying in an a4
    on NA engines it's great running in upwards of 4.11's or even 4.56(for the 1/8), but when shooting some spray it changes everything. you get your MPH much quicker and possibly run out of RPM range if not chosen properly for what you're wanting to do. gearing is specific to your primary goals for the car.

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