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Thread: Gears, Gears, Gears

  1. #1
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    Question Gears, Gears, Gears

    I haven't quite comprehended the concept of gears...all this "3.55, 4.10" stuff. All I know is what's stock on the Marauder and that most people get a higher gear ratio for off the line quickness, or something. Anyways, could someone please explain all this? That would be great. Thanks a bunch!
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    Thank ya!
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  4. #4
    TripleTransAm Guest
    http://auto.howstuffworks.com/differential.htm

    In a nutshell, the diff gears transmit the rotational power from the transmission output shaft to the axles. If they were 1:1 ratio, the axles would rotate once for every rotation of the transmission shaft, and the torque on the axle shafts would be equal to the torque on the transmission shaft.

    With a gear reduction like 3.55:1 (stock Marauder), the axles rotate once for every 3.55 revolutions of the transmission shaft, the benefit being that the axle shafts also receive 3.55 times the torque on the tranny output shaft.

    Going to a 4.10:1 diff ratio, now it takes 4.10 revolutions of the tranny shaft to get one axle revolution, but the torque on those axles is now 4.10 times what is applied to the tranny shaft. More torque on the axles equals more force at the tire contact patch equals better acceleration.

  5. #5
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    I rode in Logan's with 4:30's...dammit I was wrong. I here by no longer preach 4:10's as the best setup N/A.
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  6. #6
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    Triple,
    Very well stated...simple to comprehend.
    One comment...I think as the axle ratio is numerically increased, the maximum MPH of the vehicle decreases.
    Years ago, I had a '64 Plymouth with a 426 hemi and a 4.89 gear ratio that limited my top end to about 95 MPH.
    Just food for thought !

  7. #7
    Hemlock Guest
    IN OVERDRIVE WITH 4.30s , FINAL RATIO IS 3.05 X 5300 RPM = 150 . JUST RIGHT FOR A NICE CRUISE .!! CHEERS.

  8. #8
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    Also, as the rear gear ratio rises (higher number, fewer rotations, more torque) the engine RPM for any given speed increases, too, right?
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  9. #9
    TripleTransAm Guest
    Sounds right. You can calculate the new RPM at any speed with a new gear by simply dividing your speed by the old gear ratio, then multiplying it by the new gear ratio.

    Fictitious example:
    to find out how much faster your engine will be turning at 60 mph by going from 3.55 gears to 4.10s, take the RPM at 60 mph and divide it by 3.55 . Then take the result and multiply it by 4.10, and there's your new RPM.

  10. #10
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    And with the higher rpm's many have also added a new drive shaft like the metal matrix one, I think.

  11. #11
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    TripleTransAm...That was JUST the answer I was looking for.
    2007 Honda Accord V6. Fit for a father of two. 5% tint all around.

  12. #12
    bigbaga Guest

    question regarding traction control

    I learn a little more every time I have the time to read the threads on this great site. I spoke to Dennis Rinehart today to inquire about the Stage 1, cost, difficulty of installation etc. What I didn't think to ask was, if I have the 4:10 gears installed will traction control still function?

    Hope this isin't too dumb a question.

    Big Baga (Greg)

  13. #13
    TripleTransAm Guest

    Re: question regarding traction control

    Originally posted by bigbaga
    What I didn't think to ask was, if I have the 4:10 gears installed will traction control still function?
    I don't think there is any reason why it should not continue to function.

    The traction control compares wheel speeds, not engine RPM. With 4.10s, you're still maintaining the same front/rear ratio of wheel speeds (the front wheels are always turning slightly faster because they're smaller), only your engine is turning faster now because the tranny output shaft has to turn faster for any given road speed as compared to the 3.55s.

    I believe the traction control uses the ABS sensors to measure wheel rotational speed. So your tranny shaft could be running at 2x the stock speed for a given RPM because you decided to go with 7.10 : 1 gears instead of the stock 3.55 : 1 but the traction control won't care, he's only paying attention to front and rear wheel speeds.

  14. #14
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    Yes, traction control still works.

    TTA's assertion that the TC uses ABS sensors is most likely correct.

    Since I've had the 4:10's, I've tripped the TC 3 times. The car would get a wee bit sideways during WOT 1-2 shift and it would snap right back with the TC light flashing at me like an over protective mother.

    So, yep. It does.
    Dave

  15. #15
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    AgentM79,

    Seems like the 4.10 would reduce the overall life of the engine components due to higher engine RPM.
    What effect does your 4.10 have on fuel economy compared to the stock 3.55 ?

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