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guess the rear gears!!??

Discussion in 'Trucks [ Eighteen Wheelers ]' started by texas rattler, Feb 5, 2013.

Page 1 of 2
  1. Feb 5, 2013 #1
    texas rattler

    texas rattler Light Load Member

    76
    13
    Aug 7, 2011
    cat spring texas
    0
    ok, im back working with my pete. took it to get inspected and on the way home ran 70, ok heres the question at 70 the tach reads 1800 rpm . the motor is a 3406b with a 13 spd and tires are 24.5 . i found on the eaton rears thay are marked 3:36 can that be right? could the rears have been built with different gears? that rpm seems high? what do yall think? thanks
     
    texas rattler, Feb 5, 2013
    texas rattler, Feb 5, 2013
    #1
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  3. Feb 5, 2013 #2
    Smellfunny

    Smellfunny Road Train Member

    1,446
    967
    Jan 28, 2012
    South Carolina
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    Smellfunny, Feb 5, 2013
    Smellfunny, Feb 5, 2013
    #2
    texas rattler Thanks this.
  4. Feb 5, 2013 #3
    texas rattler

    texas rattler Light Load Member

    76
    13
    Aug 7, 2011
    cat spring texas
    0
    hey thanks thats a neat deal, so going by that 4:11 or 4:33 yikes i guess its common to swap out gears from one 3rd member to another ?
     
    texas rattler, Feb 5, 2013
    texas rattler, Feb 5, 2013
    #3
  5. Feb 5, 2013 #4
    Smellfunny

    Smellfunny Road Train Member

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    Jan 28, 2012
    South Carolina
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    What is the model of the transmission?

    If it is a 13 speed direct then 3.36 ratio at 1800 RPM = 67.5 MPH
     
    Smellfunny, Feb 5, 2013
    Smellfunny, Feb 5, 2013
    #4
  7. Feb 5, 2013 #5
    texas rattler

    texas rattler Light Load Member

    76
    13
    Aug 7, 2011
    cat spring texas
    0
    i guess i need to get the numbers off the tag on the tranny to know exactly,that would tell right
     
    texas rattler, Feb 5, 2013
    texas rattler, Feb 5, 2013
    #5
  8. Feb 5, 2013 #6
    SmokinCAT

    SmokinCAT Road Train Member

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    Oct 20, 2010
    Hillsboro, OH./ Adrian, MI
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    You need to be sure of the trans model number or list a year for your truck, and are you running stand up 24.5 or LP. I just figured it up, and if you have a regular RTO series transmission with a .87 over drive you could have 3.70s and still be turning that rpm if your running LP 24.5.
     
    SmokinCAT, Feb 5, 2013
    SmokinCAT, Feb 5, 2013
    #6
    texas rattler Thanks this.
  9. Feb 5, 2013 #7
    texas rattler

    texas rattler Light Load Member

    76
    13
    Aug 7, 2011
    cat spring texas
    0
    the truck is 1990 and the tires are not lp, tomorrow ill get the tag number.
     
    texas rattler, Feb 5, 2013
    texas rattler, Feb 5, 2013
    #7
  10. Feb 5, 2013 #8
    SmokinCAT

    SmokinCAT Road Train Member

    1,773
    1,487
    Oct 20, 2010
    Hillsboro, OH./ Adrian, MI
    0
    Most likely it is a RT/RTO14613. I think you probably have a RTO and someone has put 3.70s in it.
     
    SmokinCAT, Feb 5, 2013
    SmokinCAT, Feb 5, 2013
    #8
  11. Feb 5, 2013 #9
    379exhd

    379exhd Road Train Member

    2,925
    3,153
    Jun 25, 2012
    rolling through hell
    0
    ahhh the days of counting teeth on the ring gear and dividing them by the number of teeth on the pinion to figure out what gears are in a truck that's 20 years old and has changed hands times than the $10 hooker on the corner in vegas. Good luck driver.
     
    379exhd, Feb 5, 2013
    379exhd, Feb 5, 2013
    #9
    texas rattler Thanks this.
  12. Feb 6, 2013 #10
    texas rattler

    texas rattler Light Load Member

    76
    13
    Aug 7, 2011
    cat spring texas
    0
    ok tranny tag says rto14613
     
    texas rattler, Feb 6, 2013
    texas rattler, Feb 6, 2013
    #10
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