looking for info on 3.70 ratio

Discussion in 'Trucks [ Eighteen Wheelers ]' started by lovesthedrive, Aug 26, 2009.

  1. Aug 26, 2009 #1
    lovesthedrive

    lovesthedrive R.I.P.

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    I have driven trucks with a 3.55 (13 speed)and know at 1500 rpm I will get 65 mph. I am looking at getting a truck with 3.70 ratio and would like to know at what speed are you getting at 1500 rpm.

    Many thanx for your replies. Yes the rest of you with 10 speeds or what ever can reply too.
     
    lovesthedrive, Aug 26, 2009
    lovesthedrive, Aug 26, 2009
    #1
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  3. Aug 26, 2009 #2
    Old Man

    Old Man Road Train Member

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    Depends on the size of the tires and the final drive ratio of the trans.
     
    Old Man, Aug 26, 2009
    Old Man, Aug 26, 2009
    #2
  4. Aug 26, 2009 #3
    wheathauler

    wheathauler Trucker

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    10 speed, 22.5 low pros, 1500 rpm....65 mph. 3.70 rears
     
    wheathauler, Aug 26, 2009
    wheathauler, Aug 26, 2009
    #3
  5. Aug 26, 2009 #4
    lovesthedrive

    lovesthedrive R.I.P.

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    Thankyou Wheat. Any others?
     
    lovesthedrive, Aug 26, 2009
    lovesthedrive, Aug 26, 2009
    #4
  7. Aug 27, 2009 #5
    Les2

    Les2 Road Train Member

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    I've got the RTLO16913A final drive is .73 with 3.70's @1500rpm doing 70-72mph with tall 24.5 tires.
     
    Les2, Aug 27, 2009
    Les2, Aug 27, 2009
    #5
  8. Aug 28, 2009 #6
    rollin coal

    rollin coal Road Train Member

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    My truck runs 67 mph at 1500 rpm - 3:70 rears, 22.5 tires, 13 sp od - it pulls good but I'd rather have 3:55's
     
    rollin coal, Aug 28, 2009
    rollin coal, Aug 28, 2009
    #6
  9. Aug 29, 2009 #7
    Big Red

    Big Red Lonestar

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    1400 RPM...24.5 tires......10 speed 3.70


    1500 RPM...24.5 tires......10 speed 3.90


    1600 RPM...24.5 tires......10 speed 4.11

    65 mph.


    The trucks I drive are set up like this.......3.90s deliver the best economy overall for the terrain we travel at gross weight.

    Rolling hills and flat 50-50 loaded and empty...out loaded and back empty.
     
    Big Red, Aug 29, 2009
    Big Red, Aug 29, 2009
    #7
    jacksd3 Thanks this.
  10. Aug 30, 2009 #8
    lovesthedrive

    lovesthedrive R.I.P.

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    Very useful post, thankyou for posting
     
    lovesthedrive, Aug 30, 2009
    lovesthedrive, Aug 30, 2009
    #8
  11. Aug 30, 2009 #9
    Hardlyevr

    Hardlyevr Road Train Member

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    Hardlyevr, Aug 30, 2009
    Hardlyevr, Aug 30, 2009
    #9
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