Allison 6620

The Allison 6620 transmission, part of the esteemed Off Road Series™, is specifically designed to excel in the harshest of conditions. With its robust capabilities and advanced features, it stands as a testament to engineering excellence. This article delves into the detailed specifications, unique features, and diverse applications of the Allison 6620, showcasing why it is a crucial component for heavy-duty off-road vehicles.


Power and Torque Capabilities:

The Allison 6620 transmission is built to handle substantial power and torque, ensuring it meets the demands of heavy-duty off-road applications:

  • Engine Power Max Input: 760 hp (567 kW)
  • Engine Torque Max Input: 2500 lb-ft (3390 N•m)
  • Max Turbine Input: 3790 lb-ft (5139 N•m)

These impressive specifications guarantee that the Allison 6620 can deliver the necessary power and torque to manage the most challenging tasks in off-road environments.

Robust Design for Heavy-Duty Applications:

Engineered for durability, the Allison 6620’s construction ensures long-term reliability and performance, making it ideal for vehicles operating in tough conditions. Its robust build can withstand the rigors of off-road work, ensuring it remains reliable under heavy loads.

Advanced Control Systems:

Equipped with advanced control systems, the Allison 6620 offers seamless gear shifts and efficient operation. The fully automatic nature of the transmission reduces driver fatigue and enhances overall vehicle performance.


The Allison 6620 transmission is perfectly suited for heavy-duty off-road vehicles, making it ideal for a range of applications:

Articulated Dump Trucks:

In rugged terrains, articulated dump trucks require a transmission that can handle significant power and torque. The Allison 6620 ensures these trucks can manage heavy loads efficiently, improving productivity and performance.

Rigid Dump Trucks:

Used extensively in mining and construction, rigid dump trucks need reliable and powerful transmissions. The Allison 6620 provides the necessary performance to handle demanding jobs, ensuring these vehicles operate effectively in challenging environments.

Rigid Rear Dump Trucks:

Essential for large-scale construction and mining operations, rigid rear dump trucks benefit greatly from the high power and torque capabilities of the Allison 6620. This transmission ensures they can manage heavy loads and continuous operation with ease.

Features and Benefits

Higher Horsepower and Torque Ratings:

The Allison 6620 stands out for its high horsepower and torque ratings, enhancing vehicle performance and allowing for larger payloads and increased delivery frequencies. This leads to higher productivity and operational efficiency.

Enhanced Durability and Reliability:

With its robust design, the Allison 6620 is built to withstand the harsh conditions of off-road work. This durability reduces the need for frequent maintenance and repairs, lowering operational costs and increasing vehicle uptime.

Seamless Automatic Operation:

The fully automatic nature of the Allison 6620 provides smooth and seamless gear shifts, reducing driver fatigue and allowing for more precise control over the vehicle. This enhances overall safety and performance.

Optimized Fuel Efficiency:

The Allison 6620 is designed to optimize fuel efficiency, helping to reduce operational costs. By ensuring that the engine operates within its most efficient range, the Allison 6620 helps lower fuel consumption and emissions.

Customizable Options:

Allison offers a range of customizable options for the Allison 6620, allowing operators to tailor the transmission to their specific needs. This flexibility ensures that each vehicle can be optimized for its particular application, enhancing performance and efficiency.

Why Choose the Allison 6620?

The Allison 6620 transmission is a standout in the heavy-duty off-road market due to its exceptional power, durability, and advanced features. Here’s why it is the preferred choice for off-road applications:

Proven Performance:

With a track record of reliability and performance, the Allison 6620 is trusted by operators in some of the most demanding industries. Its ability to handle high power and torque makes it ideal for heavy-duty off-road vehicles.

Increased Productivity:

By allowing for larger payloads and more frequent deliveries, the Allison 6620 helps increase overall productivity. Its robust design ensures long-term reliability, reducing downtime and maintenance costs.

Enhanced Driver Comfort and Safety:

The fully automatic operation of the Allison 6620 reduces driver fatigue and enhances safety. Seamless gear shifts and precise control make it easier for drivers to manage their vehicles, even in challenging conditions.

Lower Operational Costs:

Optimized fuel efficiency and reduced maintenance requirements help lower overall operational costs. The Allison 6620 is designed to provide long-term reliability, ensuring a good return on investment.

Comprehensive Support:

Allison Transmission offers comprehensive support for the Allison 6620, including maintenance services, spare parts, and technical assistance. This ensures that operators can keep their vehicles running smoothly and efficiently.


The Allison 6620 transmission, a part of the Off Road Series™, is engineered to meet the rigorous demands of off-road work environments. Its high horsepower and torque capabilities, combined with advanced control systems and robust construction, make it ideal for heavy-duty applications such as articulated dump trucks, rigid dump trucks, and rigid rear dump trucks. By choosing the Allison 6620, operators can enhance productivity, reduce operational costs, and ensure reliable performance in the toughest conditions. The Allison 6620 represents a superior solution for anyone looking to optimize their off-road operations and achieve long-term success in demanding environments.