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A quick question for a rear gear ratio guru.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Blackducati750, May 4, 2015.

Page 1 of 2
  1. May 4, 2015 #1
    Blackducati750

    Blackducati750 Light Load Member

    193
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    Mar 11, 2009
    Bushkill,PA
    0
    If I bought a truck with:

    11R22.5 rubber

    Eaton Fuller 10spd trans. (Not sure which model, but I'm pretty sure it's an O/D trans)

    and 5.29 rear gears,

    what would the cruising RPMs be at 65, 70, and 75mph?
     
    Blackducati750, May 4, 2015
    Blackducati750, May 4, 2015
    #1
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  3. May 4, 2015 #2
    Cat sdp

    Cat sdp . .

    19,871
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    Orion's Belt
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    Are you sure about 5.29s ? If that's correct, it's a stump puller.....

    go on Eatons web site and it has a calculator where you plug in all those #s and it will give you rpms/ speed....
     
    Last edited: May 4, 2015
    Cat sdp, May 4, 2015
    Cat sdp, May 4, 2015
    #2
    double yellow Thanks this.
  4. May 4, 2015 #3
    Old Man

    Old Man Road Train Member

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    Oklahoma City, OK
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    Old Man, May 4, 2015
    Old Man, May 4, 2015
    #3
  5. May 5, 2015 #4
    Superhauler

    Superhauler TEACHER OF MEN

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    Jan 30, 2010
    keep stroking.
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    65 to 75 it will sound like a Yamaha right before it grenades!
     
    Superhauler, May 5, 2015
    Superhauler, May 5, 2015
    #4
  7. May 5, 2015 #5
    allan5oh

    allan5oh Road Train Member

    1,557
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    Jan 6, 2010
    Winnipeg, mb
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    500 revolutions per mile for the 11r22.5s

    10 spd overdrives usually have .74 or .75 final gear, using .75:

    1984 rpm at 60

    2149 at 65

    2314 at 70

    2480 at 75
     
    allan5oh, May 5, 2015
    allan5oh, May 5, 2015
    #5
  8. May 5, 2015 #6
    WitchingHour

    WitchingHour Road Train Member

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    Broomfield, CO
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    Is this a single axle? If this were a line haul tractor, I'd double check that rear end ratio.
     
    WitchingHour, May 5, 2015
    WitchingHour, May 5, 2015
    #6
  9. May 6, 2015 #7
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    this is slow truck

    so run 55-65
     
    Pablo-UA, May 6, 2015
    Pablo-UA, May 6, 2015
    #7
  10. May 6, 2015 #8
    Caterpillar Cowboy

    Caterpillar Cowboy Heavy Load Member

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    Nov 11, 2010
    Wyoming
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    I have 4.33's. I won't cruise faster than 65 and won't go faster than 70 if I've really got to pinch her to get around someone.
     
    Caterpillar Cowboy, May 6, 2015
    Caterpillar Cowboy, May 6, 2015
    #8
  11. May 10, 2015 #9
    Blackducati750

    Blackducati750 Light Load Member

    193
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    Mar 11, 2009
    Bushkill,PA
    0
    It's a truck i was looking at on truck paper dot com.
    I can only assume the seller checked themselves before listing the specs. I'm sure it was some sort of construction/vocational truck. It had a huge tubular steel headache rack and only 1 fuel tank. Very low miles but high hours.
    I was just curious if a truck would even be highway-worthy with gears like that.
    I guess not. I'd kill myself if i had to drive around @ 55mph.
    The truck had a C12 Cat. I'm told they have very low cruising RPM speeds.....
     
    Blackducati750, May 10, 2015
    Blackducati750, May 10, 2015
    #9
  12. May 10, 2015 #10
    Hammer166

    Hammer166 Crusty Information Officer

    6,940
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    Aug 18, 2007
    ~8600+' and loving it!
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    Sounds like you're describing an oilfield winch truck, which may well have had an auxiliary transmission, and thus another OD to bring the final drive ratio down some more. If it had an .80 in aux to go with the .75 main, you'd get .6 * 5.29 = 3.17, which is still short geared, but far more manageable than the 3.97 you'd get with just a 10 speed
     
    Hammer166, May 10, 2015
    Hammer166, May 10, 2015
    #10
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