Check out my spec

Discussion in 'Ask An Owner Operator' started by Truckie6674, Jan 15, 2021.

  1. Truckie6674

    Truckie6674 Bobtail Member

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    Jan 10, 2021
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    Looking to build one of my trucks to this spec
    455 egr 12.7 Detroit
    18 speed (ran in 17th, first overdrive)
    2.93 rears
    Lo pro 22.5s

    To be able to cruise at 68-70 at around 1475rpm working south eastern área not many mountains but may head west from time to time.

    What experience do you guys have with the 2.93 rears? What about in hills
     
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  3. AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    What's under the hood determines the speed you pull the hill. Taller rears just means you gotta drop more gears in the transmission to compensate.
     
  4. magoo68

    magoo68 Road Train Member

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    Jun 11, 2011
    st malo mb canada
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    455 egr 12.7 was a dud the pre egr 12.7versions were ok but weak from the lower torque . Driven correctly a 500 hp pre egr is hard to beat
     
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  5. REALITY098765

    REALITY098765 Heavy Load Member

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    Some time we will have to start a conversation of the term ''tall'' gears and ''short'' gears and the implications of each in a technical sense.
    Maybe not.
     
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  6. kelgar50

    kelgar50 Medium Load Member

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    Feb 1, 2007
    Bakersfield,CA
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    I had 2.93's with a 12.7 470 detroit and a 13spd.
    Never had any issues pulling hills or on take off, never had to drop to many gears to pull a hill either. Ran 48 and Canada with it pulling refers, tanks, roll offs and step deck.
     
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  7. REALITY098765

    REALITY098765 Heavy Load Member

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    The number of gears changed depends on where you started from.
    a double overdrive will change 2 more gears than a direct for example.
    That's not exact science but-------
     
  8. Truckie6674

    Truckie6674 Bobtail Member

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    Jan 10, 2021
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    What speed did you usually cruise at?
     
  9. kelgar50

    kelgar50 Medium Load Member

    334
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    Feb 1, 2007
    Bakersfield,CA
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    I usually cruised that truck between 60-65mph.
     
  10. HillbillyDeluxeTruck

    HillbillyDeluxeTruck Road Train Member

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    Mar 3, 2013
    San Antone
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    I used to run a 12.7/13spd/2.73/lo pro combo that was great. The engine put 550ish to the tires on a dyno at the time it was rebuilt so it was very healthy. Would have been an 8mpg truck if Id have ran 65 and not 70-72.
     
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