Difference in rear rating

Discussion in 'Ask An Owner Operator' started by Swift09, Nov 29, 2019.

  1. Swift09

    Swift09 Bobtail Member

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    What are the technical differences in 36, 38, and 40k rears? What performance differences would you see in running primarily flat midwest states? Thank you
     
  2. uncleal13

    uncleal13 Road Train Member

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    I have 46,000 lbs rear ends.
    The various sizes have heavier components and heavier axle housings.
    For example, a standard axle may have a 9.5 mm housing thickness, a super 40 can have an 11 mm thick axle housing and my 46's have a 12.7 mm thick housing. Of course there is a significant weight difference as you go up in capacity.
    Some have reported that the thinner housings can flex under heavy loads, causing tire wear.
     
  3. AModelCat

    AModelCat Road Train Member

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    Heavier housings, heavier duty gears inside.
     
  4. Dino soar

    Dino soar Road Train Member

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    I thought everything is heavier.

    Heavier axles, heavier gears, heavier bearings, even larger brake shoes.

    And everything is more expensive.
     
    uncleal13 Thanks this.
  5. FoolsErrand

    FoolsErrand Road Train Member

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    Id suspect all components larger, thicker, heavier and with more bolts or bigger bolts. Bigger bearings and brakes.
     
  6. SteveScott

    SteveScott Road Train Member

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