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
     
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  3. 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.
     
  4. AModelCat

    AModelCat Road Train Member

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    Edmonton
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    Heavier housings, heavier duty gears inside.
     
  5. 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.
  6. 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.
     
  7. SteveScott

    SteveScott Road Train Member

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