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373 vs 410/411

This is a discussion on 373 vs 410/411 within the Drivetrain forums, part of the LSx Technical Help Section category; what is the difference in rpms / gas mileage in a m6 car with either 373s or 410/411s? i have ...

  1. #1
    Junior Member 97ws6's Avatar
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    373 vs 410/411

    what is the difference in rpms / gas mileage in a m6 car with either 373s or 410/411s?

    i have a m6 car and im trying to decide wich one to go with thanks much.

  2. #2
    Veteran Hi-Po's Avatar
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    Probably 4.11's

    Use this site, its very helpful. Plug your car information in, or use the pull down tabs for vehicle selection at the top. Very easy.


    http://www.f-body.org/gears/
    370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator

    Build in progress...

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    Slow'er'Ass Mr. Luos's Avatar
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    Not much difference...but the 4.10's will be better for overall acceleration.

    Gas mileage around town will be down a little more with the 4.10's, but on the highway it will be pretty much the same.
    3.73's with a stock tire will turn about 1825RPM at 75MPH.
    4.10's with a stock tire will turn about 2025RPM at 75MPH.

    Personally, I have 4.11's and have been thinking about going to 4.30's.

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    Junior Member 97ws6's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Not much difference...but the 4.10's will be better for overall acceleration.

    Gas mileage around town will be down a little more with the 4.10's, but on the highway it will be pretty much the same.
    3.73's with a stock tire will turn about 1825RPM at 75MPH.
    4.10's with a stock tire will turn about 2025RPM at 75MPH.

    Personally, I have 4.11's and have been thinking about going to 4.30's.
    what about top speed differences any need to even ask this question?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by 97ws6 View Post
    what about top speed differences any need to even ask this question?
    Take a look at that link Hi-Po posted for that kind of information.

    Top speed should be calculated in 4th gear for the M6...as I don't like going WOT in overdrive gears.
    4th gear top speed on stock tire with 3.73 = 127MPH (assuming 6200RPM redline)
    4th gear top speed on stock tire with 4.10 = 115MPH (assuming 6200RPM redline)

  6. #6
    Junior Member 97ws6's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Take a look at that link Hi-Po posted for that kind of information.

    Top speed should be calculated in 4th gear for the M6...as I don't like going WOT in overdrive gears.
    4th gear top speed on stock tire with 3.73 = 127MPH (assuming 6200RPM redline)
    4th gear top speed on stock tire with 4.10 = 115MPH (assuming 6200RPM redline)
    thank you for all the info this was very helpful this is just info im gathering for my next car i am selling my 97 and wanting a ls1 car lol a bit of an upgrade in my eyes but i cant wait until i get there lol

    thanks again.

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    Member lingenfelter69's Avatar
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    Don't count out 4.30's though. I went 4.10's and now I wish I had not. It's not bad but with the m6 you can definatly get away with more gear.

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by lingenfelter69 View Post
    Don't count out 4.30's though. I went 4.10's and now I wish I had not. It's not bad but with the m6 you can definatly get away with more gear.
    4.10's are fine if your driving consists of mostly 45-65MPH roads. However, I find that in city driving I'm constantly shifting, and on the highway I'm turning more RPM's than I'd like.

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    Senior Member INMY01TA's Avatar
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    There will be no measurable difference in gas milaege between the two. I went from 3:42s to 4:10s and lost less than 1mpg so the difference between 3:73s and 4:10s would be nonexistent. Go with the 4:10s. (or higher)

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    I have 4.10. Not alot of difference in gas mileage. Big difference in torque & getting out of the hole. & pulling thru the all the gear range. Should have put 4.30

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    Member Rk ws6's Avatar
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    i too went with 4.11's definently no complaints.

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    Senior Member karpetcm's Avatar
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    I wish i had gone 4.30's but im very happy with the 4.10's no doubt. Made a huge difference in acceleration. Freeway driving for me is perfect and no complaints, rpms are still very low even at 70-75mph.

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    I have a six speed and went with 4.10's. I regret it. I shift a lot more, and RPM's feel too high at freeway speeds. Gas mileage was noticably worse. I would change back to stock 3.42's if it didn't cost so much. I guess 3.73's might be a good compromise, but I haven't tried that set up.

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