Once In A Blue Moon


When it comes to the world of trucking and heavy hauling, the rear axle is an unsung hero that plays a pivotal role in the performance of the vehicle. There are several types of rear axles designed to meet the diverse needs of the industry, each with its own unique characteristics. In this article, we will explore three of the most common types of rear axles: regular 40’s, super 40’s, and heavy-duty 46,000 rears. By understanding the differences between these axles, you can make informed decisions about which one best suits your hauling requirements.

  1. Regular 40’s – Versatile Workhorses

The regular 40 rear axle, often referred to simply as “40’s,” is a workhorse that has earned its place as the go-to choice for a wide range of hauling applications. These axles are typically rated for a load capacity of 40,000 pounds, making them suitable for various dry van and regular hauling tasks. What sets them apart is their versatility and reliability. Regular 40’s provide a balanced blend of load-bearing capacity and fuel efficiency, making them the preferred choice for many trucking companies.

Key Features of Regular 40’s:

  • Load Rating: 40,000 pounds
  • Commonly used in dry van transportation
  • Well-balanced load-bearing capacity
  • Efficient fuel consumption
  • Ideal for general-purpose hauling
  1. Super 40’s – Power-Packed Performance

Super 40 rear axles, as the name suggests, are designed for superior performance, especially in high-power-density applications. These axles are engineered to handle heavier loads and are often paired with trucks built for heavyweight tasks. What sets them apart is their ability to support a higher gross combination weight, which can go up to a staggering 160,000 pounds. This makes super 40’s the preferred choice for industries where maximizing payload capacity is essential.

Key Features of Super 40’s:

  • Load Rating: Up to 160,000 pounds
  • High power density
  • Designed for heavyweight tasks
  • Excellent performance under heavy loads
  • Preferred for industries requiring maximum payload capacity
  1. Heavy-Duty 46,000 Rears – Tackling the Heaviest Loads

When it comes to handling the heaviest loads, heavy-duty 46,000 rear axles, often referred to as “heavy spec,” are the ultimate choice. These axles are built to withstand extreme loads and challenging conditions. While heavy-duty 46,000 rears are renowned for their ability to tackle the most massive cargo, they are less fuel-efficient compared to their counterparts. This trade-off is necessary to ensure the axles can handle the immense weight they are designed for.

Key Features of Heavy-Duty 46,000 Rears:

  • Load Rating: 46,000 pounds
  • Ideal for extremely heavy loads
  • Built for rugged and challenging conditions
  • Less fuel-efficient compared to other axles
  • A necessary choice when hauling the heaviest cargo


In the world of heavy hauling, the choice of rear axle is a critical decision that can significantly impact a truck’s performance. Regular 40’s offer versatility and efficiency, making them suitable for a wide range of applications. Super 40’s excel in high-power-density scenarios, allowing for the transportation of extraordinarily heavy loads. Heavy-duty 46,000 rears are the top choice when extreme load-bearing capabilities are required, even though they come at the cost of reduced fuel efficiency.

Ultimately, the choice of rear axle should align with the specific needs of your hauling operations. Understanding the differences between these three common types of rear axles is essential for making informed decisions and ensuring the successful transportation of goods across the miles.

Leave a Reply

Your email address will not be published. Required fields are marked *

LIVE on Twitch OFFLINE on Twitch