Allison HT 750

In the demanding field of oil and gas, equipment reliability and adaptability are critical. The Allison HT 750 Transmission with Deep Reduction Drive (DRD) stands out as an exemplary piece of machinery, designed to meet the rigorous demands of this industry. This article explores the detailed specifications, applications, and unique features that make the Allison HT 750 DRD a top choice for professionals in the oil and gas sector.


Horsepower and Input Speed:

The Allison HT 750 Transmission is engineered to accommodate a wide range of horsepower and input speeds, making it versatile for various industrial applications:

  • Horse Power Min: 275 Hp
  • Horse Power Max: 525 Hp
  • Input Speed Min: 1800 rpm
  • Input Speed Max: 2500 rpm

This range ensures optimal performance across different engine outputs and operational requirements.

Gearing and Oil Requirements:

This transmission features mechanical gearing with five forward gears and one reverse gear, with an optional additional reverse gear for enhanced maneuverability. The recommended oil type is C-4, 15W40, with a required quantity of 7 gallons, ensuring the transmission remains well-lubricated and efficient.

Mounting and Weight:

The HT 750 can be mounted using an SAE No. 1 Automatic Flywheel Housing, with options for Flexplate Drive and Remote Mount Flange applications. This versatility in mounting options makes it suitable for a variety of machinery setups. The transmission’s weight ranges from 1100 lbs to 1350 lbs, highlighting its lightweight yet durable construction.

Torque Converter Ratios and Control Systems:

The transmission offers multiple torque converter ratios (TC-499, TC-498, TC-497, TC-495, TC-490, TC-470), providing the necessary torque multiplication for different loads. The control system is a manual hydraulic setup, offering precise and responsive control over the transmission’s performance.

Optional Engine Driven PTO and Cooler System:

The optional engine-driven PTOs (Power Take-Off) are available with side and top mount options, capable of intermittent or continuous operation. The remote-mounted cooler element ensures the transmission operates within optimal temperature ranges, even under strenuous conditions.


The Allison HT 750 Transmission is specifically designed for the oil and gas industry, providing the power and reliability needed in this challenging environment. Its robust construction and versatile features make it ideal for:

  • Well Service Pumps: The transmission’s ability to handle high horsepower and torque makes it perfect for well service pumps, ensuring reliable performance under heavy loads.
  • Mud Pumps: Its robust design and precise control make it suitable for mud pumping operations, where consistent power delivery is crucial.
  • Workover Rigs and Pulling Units: The HT 750 is also ideal for workover rigs and pulling units, providing the reliability needed for continuous operation.

Features and Benefits

Versatile Control:

The Allison HT 750 Transmission with Deep Reduction Drive (DRD) offers both automatic hydraulic five-speed forward and one reverse gear, as well as a manual hydraulic power shift system. This dual-mode application is particularly beneficial in oil and gas operations where automatic control is required for road travel, and manual control is needed for precise gear shifting during well servicing.

High-Grade Construction:

The transmission is built with high-grade aluminum main housings, ensuring durability and longevity. It utilizes the Allison 400 series converter, providing a range of stall to torque ratios, making it adaptable to various operational needs.

Deep Reduction Drive:

One of the standout features of the HT 750 is the Deep Reduction Drive (DRD). This feature allows for significant torque multiplication, essential for handling heavy loads and providing precise control during demanding operations.

Enhanced PTO Capabilities:

The wet model of the HT 750 indicates that this transmission can run PTOs off of the converter housing, a feature not available in all transmissions. This capability enhances the versatility and functionality of the transmission, making it suitable for a wider range of applications.

Efficient Cooling System:

The remote-mounted cooler element ensures the transmission remains within optimal temperature ranges, preventing overheating and ensuring consistent performance even during prolonged use.

Why Choose the Allison HT 750 DRD?

The Allison HT 750 Transmission with Deep Reduction Drive is a preferred choice in the oil and gas industry due to its power, versatility, and advanced features. Here’s why it excels:

Proven Reliability:

The HT 750 has a proven track record of reliability in the oil and gas sector, with its robust design and high-quality components ensuring it can handle the toughest jobs.

Adaptable Solutions:

With various mounting options and torque converter ratios, the HT 750 offers flexible solutions that can be tailored to meet specific operational needs, ensuring optimal performance.

Comprehensive Support:

S&W Power Systems offers fully remanufactured, rebuilt, and dyno-tested transmissions, ensuring each HT 750 is ready to perform under the most demanding conditions. This comprehensive support ensures reliability and reduces downtime.

Economic Efficiency:

The durability and reliability of the HT 750 translate into economic efficiency. With fewer breakdowns and less frequent maintenance, companies can save on operational costs and ensure higher productivity.


The Allison HT 750 Transmission with Deep Reduction Drive is a powerhouse designed to meet the rigorous demands of the oil and gas industry. Its combination of high power, precise control, and robust construction makes it an invaluable asset for operations that require reliability and performance. Whether it’s well servicing, mud pumping, or any other demanding application, the HT 750 delivers the power and precision needed to excel. Investing in this transmission means choosing a solution that offers long-term reliability, economic efficiency, and unmatched performance in the toughest conditions.