3.90 to 4.10

Discussion in 'Trucks [ Eighteen Wheelers ]' started by 281ric, Oct 30, 2014.

  1. 281ric

    281ric Road Train Member

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    there a big difference?
     
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  3. Ezrider_48501

    Ezrider_48501 Road Train Member

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    is there a big difference between 3.36 and 3.55's
     
  4. 281ric

    281ric Road Train Member

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    honestly, I haven't been driving long enough to answer that question I haven't driven a lot of different trucks . I was hoping y'all w more experience would help me.
     
  5. Ezrider_48501

    Ezrider_48501 Road Train Member

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    theirs a noticeable difference between the two. both are pretty low gears. without accually calculating it i would say roughtly 150 rpm difference higher rpm with 4.10's over 3.90's for the same speed/gear selection
     
  6. 281ric

    281ric Road Train Member

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    thanks. truck I drive now has 3.90, I saw a truck that caught my eye that has 4.10, again. haven been driving for to long and not as mechanically inclined as I would like to be.
    Thx for the input.:biggrin_25520:
     
  7. Scrapper

    Scrapper Light Load Member

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    What will you be hauling with it? We run alot of 3.90's and they are borderline too low. Especially on the Indian Nation Turnpike. We run 80-100,000 most every run, utility poles.

    It would also depend on the engine, tranny combo in the truck.
     
  8. beemergary

    beemergary Light Load Member

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    .95 x rpm with 3.90 gears extra. Like Ezrider said + 150 rpm's if you run at 1500 rpm's so with 4.10 at same mph would be 1650 rpm's
     
  9. dustinbrock

    dustinbrock Road Train Member

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    Noone mentioned the biggest part. Are the tire sizes the same? 4:11 on 24.5 rubber will turn the exact same rpm as 3:90 on 22.5 rubber.
     
    281ric Thanks this.
  10. beemergary

    beemergary Light Load Member

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    Don't forget the torque curve of engine and ratio of trans. gears.
     
    281ric Thanks this.
  11. VARITHMS

    VARITHMS Medium Load Member

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    281ric Thanks this.
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