The Allison AT545 Transmission is a durable, fully automatic transmission designed for medium-duty trucks and vocational vehicles, delivering reliable performance in a wide variety of commercial applications. Whether you’re operating service vehicles, delivery trucks, or construction equipment, the AT545 ensures smooth shifting, high torque handling, and long-lasting reliability, even under demanding conditions. Engineered for industries where performance and dependability are critical, the AT545 is the ideal choice for drivers looking to maximize uptime and operational efficiency.

With its high torque capacity, ease of maintenance, and fuel-efficient features, the Allison AT545 ensures seamless vehicle performance while minimizing downtime and lowering overall operational costs. It’s the solution for a wide range of medium-duty truck applications requiring strength, reliability, and ease of operation.

Key Features:
  • High Torque Handling: Capable of handling up to 545 lb-ft of input torque, the AT545 is designed to manage demanding loads while maintaining smooth operation and consistent performance.
  • Fuel Efficiency: With a lock-up torque converter and optimized gear ratios, the AT545 helps reduce fuel consumption, lowering overall operational costs without sacrificing performance.
  • Durability: Built to withstand tough environments, the AT545 ensures long-lasting reliability with minimal maintenance requirements, helping to maximize vehicle uptime.
  • Smooth Shifting: The 4-speed automatic transmission ensures seamless shifting for superior driver comfort and improved vehicle control in various conditions.
  • Versatile Applications: Ideal for a wide range of medium-duty vehicles including service, delivery, and construction trucks, providing both exceptional drivetrain performance and operational efficiency.
  • Low Maintenance: Designed for reduced maintenance, the AT545 helps minimize downtime and repair costs, extending the service life of the transmission and vehicle.
Additional Resources:
Technical Specifications:
  • Transmission Type: 4-speed automatic
  • Torque Converter: Lock-up type for improved fuel efficiency
  • Input Shaft Torque Rating: 545 lb-ft (740 Nm)
  • Maximum Input Speed: 2500 RPM
  • Output Shaft Torque Rating: 545 lb-ft (740 Nm)
  • Gear Ratios:
    • 1st Gear: 3.50
    • 2nd Gear: 2.20
    • 3rd Gear: 1.46
    • 4th Gear: 1.00
  • Weight: Approx. 560 lbs (254 kg)
  • Cooling System: Water-cooled with integrated transmission cooler
  • Applications: Medium-duty trucks, service vehicles, delivery trucks, vocational trucks, construction vehicles, and more

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We are an Allison Transmission(R) Authorized Dealer. We have Allison factory trained and certified technicians, and an Allison certified customer support staff which is experienced and knowledgeable. All 1K through 4K transmissions are fully remanufactured with 100% genuine Allison components. All 1K and 2K torque converters are replaced with NEW genuine. All valve bodies are fully remanufactured and tested on our state of the art valve body test stand. All friction plates, solenoids, sensors and bearings are automically replaced. All transmissions are fully tested on our dynamometer upon completion. AT, HT, and MT Legacy series transmissions are also available. Hundreds of remanfuctured transmissions in stock and ready for immediate exchange which comes with a 3 year parts and labor warranty.

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