Specs for otr flatbed

Discussion in 'Flatbed Trucking Forum' started by Soon2BeOwnerOperator, May 27, 2023.

  1. Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    What is best rear ratio for a 12.7l detroit 60 series with a 13 speed?
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    OD 13 or direct? 3.70-3.90 depending on target speed with OD, 2.70-2.90 ish direct also depending
     
  4. Espressolane

    Espressolane Road Train Member

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    Depends on what the 13 speed is.
    You have to look at what the combined ratios for the transmission and the differential are. Have run 3:70, 3:55 and 3:42 diffs with a 13 speed transmission. All had slightly different characteristics.
     
  5. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Good points. Expected terrain also changes the equation
     
  6. beastr123

    beastr123 Road Train Member

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    In my opinion 3.73 or 3.90 if your planning to load heavy(above 85K) to off pavement points (construction sites etc) or mountainous terrain.
    Between 3.55 and 3.08 if limited off pavement type work or light loads.
     
  7. Espressolane

    Espressolane Road Train Member

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    All a 13 speed is, is a 9 speed overdrive transmission that can split the top gears. Basically overdrive on or off.
     
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