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6th Gear Sucks with 3.42s

This is a discussion on 6th Gear Sucks with 3.42s within the Drivetrain forums, part of the LSx Technical Help Section category; 99 TA M6 Besides the fact that I get mid to high 20s in mpg my 3.42s suck in 6th ...

  1. #1
    ASE CERTIFIED BaddBird's Avatar
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    Midnight Blue
    1999 Trans Am

    6th Gear Sucks with 3.42s

    99 TA M6 Besides the fact that I get mid to high 20s in mpg my 3.42s suck in 6th gear. 3.90s or 4.10s? What do you guys think?This car has never seen the track but I m sure it will happen sooner or later.It is a 3rd car but it is driven alot [and by driven I mean Rodded the hell out of].Anybody running 3.90s or 4.10s let me know the pros & cons

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    Slow'er'Ass Mr. Luos's Avatar
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    Don't use 6th gear as a racing gear.
    For that matter, don't use 5th either. Those are overdrive gears and they aren't nearly as strong as 1 through 4.

    I have 4.11's. Top speed in 4th gear is 124MPH at 6700 RPM's.
    You want a gearset that matches your power range and output.
    4.11's are a little too much for me on a 26" tire at sea level. Car will trap faster than 124MPH off the mountain. But most of my racing is here on the mountain, so I went with the 4.11's.

    I turn 2,000 RPM's at 75MPH in 6th gear with the 4.11's.

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    ASE CERTIFIED BaddBird's Avatar
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    Midnight Blue
    1999 Trans Am

    I know you run a cammed and built 402 but what kind of mileage do you get?

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    Slow'er'Ass Mr. Luos's Avatar
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    19-20MPG on the highway it seems. Don't really pay that much attention to it...don't own that car to get good mileage.

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    Senior Member clg82's Avatar
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    2000 Trans Am

    Quote Originally Posted by Mr. Luos View Post
    19-20MPG on the highway it seems. Don't really pay that much attention to it...don't own that car to get good mileage.
    how good is 3.73 in an automatic?
    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.

  6. #6
    Slow'er'Ass Mr. Luos's Avatar
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    That is what I would go with unless I was building a drag only car. In the A4 anyways.

  7. #7
    Firebird Encyclopedia 9T8W66's Avatar
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    Yeah like Mr Lous said 5th and 6th are overdrives.
    A stock car will top out at 160mph in 5th gear, The stock engine doesn't make enough HP to push the car faster in 6th gear cause it can't overcome the air drag.
    4.10's are optimal for stock or mild M6 cars
    3.73's are optimal for A4's
    Craig
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    Senior Member INMY01TA's Avatar
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    4:11's here. No cons.

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    Bolt-On Pimp ImpalaSSpeed96's Avatar
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    What does the 3.73s in a M6 equate to? Its gotta be like a 2.9X final drive in an auto??

    I was thinking at least 410s in a M6 car. Car I'm getting has 373s in it but was gonna upgrade to at least 410s if the rear ever went on me.
    96 Imp SS- 12.74@103, 1.74 60' out of fuel

    06 AWD TB SS- 12.58@106, 1.76 60'

    01 Camaro SS- Totaled

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    Slow'er'Ass Mr. Luos's Avatar
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    www.f-body.org/gears

    Great calculator for our cars.

  11. #11
    2 SS's are better than 1 Jays00ss's Avatar
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    I have 3.90's. When I get my 9" I'm going with 4.10's or even 4.30's. I agree with Luos, I didn't buy the car for gas milage, thats what my little daily driver '06 Kia Rio is for.
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

    1971 SS ElCamino 402 Big Block 550HP

    2006 Silverado 2500HD 496 cubic inches of pure muscle

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    Bolt-On Pimp ImpalaSSpeed96's Avatar
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    Black
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    Eeek First gear is 2.66 w/ 315s.....

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