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Allison AT545 Transmission for Sale

(3 reviews)
  • Type: Automatic Transmission
  • Model: AT545
  • Maker: Allison Transmission
  • Speeds: 4-speed
  • Condition: Used


99.5% Positive feedback
  • Consistently receives highest buyers ratings
  • Ships items quickly
  • Has earned a track record of excellent service


Reliable Allison AT545 Transmission for Sale

The Allison AT545 transmission, a four-speed automatic transmission renowned for its durability and reliability, is designed to handle the rigorous demands of medium-duty commercial vehicles. Whether managing a fleet of school buses, operating commercial trucks, or upgrading your RV, the AT545 transmission is a time-tested solution that delivers consistent results. If you are in the market for a robust, dependable transmission that can enhance your vehicle’s performance and longevity, consider the Allison AT545 transmission for sale at our site—a transmission engineered to withstand the test of time and heavy usage.

AT545 Transmission: Reliable Performance for Heavy-Duty Vehicles

The AT545 transmission is renowned for its reliable performance in heavy-duty vehicles. Engineered by Allison, this 4-speed automatic transmission is designed to handle demanding applications, offering smooth shifting and durability. It’s particularly favored in commercial trucks, buses, and vocational vehicles due to its robust construction and ease of maintenance. The AT545’s torque converter provides efficient power transfer, enhancing vehicle performance and fuel efficiency. With a reputation for reliability and longevity, the Allison AT545 transmission is a trusted choice for operators seeking dependable performance in rigorous environments, ensuring minimal downtime and consistent operation under heavy loads.

Features of AT545 Transmission

  • Four-Speed Automatic Operation: The AT545 offers smooth, automatic shifting through four forward speeds, reducing driver fatigue and improving overall vehicle operation.
  • Durability: Built to withstand the rigors of heavy-duty use, the AT545 is known for its robust construction and long service life.
  • Simplicity: Without a lockup torque converter, the AT545 has a simpler design compared to newer models, often resulting in easier and less costly repairs.
  • Power Take-Off (PTO) Capability: Many AT545 units come with PTO options, allowing for the operation of additional equipment like pumps or lifts directly from the transmission.
  • Versatility: The AT545 is compatible with a wide range of vehicle types, including buses, trucks, and RVs, making it a versatile choice for fleet managers.
  • Proven Track Record: With decades of use in various industries, the AT545 has established itself as a reliable workhorse in the medium-duty transmission market.
  • Cost-Effective: Often more affordable than newer models, the AT545 provides a balance of performance and value, especially for operators with budget constraints.
  • Easy Maintenance: The straightforward design of the AT545 generally translates to simpler maintenance procedures, potentially reducing downtime and service costs.

The AT545 Transmission Fits


  • Trucks : Freightliner M2 106, International 4300, Ford F-650, Ford F-750, Chevrolet Kodiak C4500, GMC TopKick C5500, Hino 268
  • Buses: Blue Bird Vision (School Bus), Thomas Built Saf-T-Liner C2 (School Bus), IC Bus CE Series (School Bus), Freightliner XB Series (Transit Bus), Chevrolet Express Cutaway (Shuttle Bus)
  • Delivery and Utility: Freightliner MT45 (Step Van), Ford E-450 (Utility Truck), International 4300 (Refrigerated Truck)
  • Emergency Vehicles: Pierce Enforcer (Fire Truck), International 4300 (Ambulance)
  • Specialty Vehicles: Chevrolet Kodiak C4500 (Dump Truck), Ford F-650 (Tow Truck), Freightliner M2 106 (Construction Vehicle)
  • Agricultural Vehicles: International 4300 (Farm Truck)
  • Military and Government: Stewart & Stevenson M1078 LMTV (Light Medium Tactical Vehicle)


  • Diesel Engines: Cummins B Series (e.g., 5.9L Cummins), International DT Series, Caterpillar 3126, Ford Power Stroke 7.3L
  • Gasoline Engines: General Motors 6.0L Vortec, Ford Triton V10, International T444E 7.3L V8
  • Other Engines:Mercedes-Benz OM904, Perkins 1000 Series

Why Choose Our AT545 Transmission?

When you’re looking for an Allison AT545 transmission for sale, quality and reliability are paramount. Here’s why our offerings stand out:

  1. Rigorous Testing: Each AT545 transmission undergoes thorough inspection and testing.
  2. Competitive Pricing: Our AT545 transmissions are priced competitively
  3. Compatibility: Suitable for a wide range of vehicle makes and models.

Performance and Reliability

The Allison AT545 transmission is renowned for its reliable performance in various applications. While it may be underrated for higher torque engines and can experience overheating on long grades, it remains a popular choice for many fleet operators due to its:

  • Simplicity of design
  • Ease of maintenance
  • Proven track record in medium-duty applications

Comparing the AT545 Transmission

When considering an Allison AT545 transmission for sale, it’s essential to understand how it stacks up against other options:

  • vs. Manual Transmissions: Offers easier operation and potentially lower driver fatigue.
  • vs. Newer Allison Models: While newer models may offer more advanced features, the AT545 remains a cost-effective and reliable choice for many applications.

Don’t miss out on our high-quality Allison AT545 transmission. Whether you’re maintaining a fleet or upgrading a single vehicle, we have the perfect AT545 transmission to meet your needs. Here at Find Auto Parts Online you will find the Allison AT545 Transmission for Sale at the most reasonable and perfect price.

Additional information

Torque Rating

Up to 550 lb-ft

Overall Length

31.5 inches

Bellhousing to Tailshaft Length

24 inches


320 pounds without fluid

Fluid Type

Automatic Transmission Fluid (ATF), Dexron III or equivalent

Fluid Capacity

12-15 quarts

Input Shaft

10 spline, 1.25in in diameter

Output Shaft

16 spline, 1.50in in diameter

Gear Ratios

1st Gear: 3.45:1
2nd Gear: 1.95:1
3rd Gear: 1.34:1
4th Gear: 1.00:1 (Direct Drive)


1990 Allison AT545 Transmission

3 reviews for Allison AT545 Transmission for Sale

  1. Matt Roberts

    Thanks to Find Auto Parts Online, I upgraded to the Allison AT545 Transmission for my Ford E-Series van. It’s been a game-changer! Smooth handling and robust performance, perfect for long hauls and tough terrain. Highly recommend Find Auto Parts Online for their excellent service and reliable products

  2. Robert Austin

    Installed the Allison AT545 Transmission from Find Auto Parts Online in my Chevy Silverado, and I’m impressed! Smooth shifts and reliable performance on and off-road. Find Auto Parts Online delivered quality and expertise, making it a great choice for anyone needing a dependable transmission upgrade.

  3. Robert Austin

    Got the Allison AT545 Transmission from Find Auto Parts Online for my Silverado. Smooth shifts and reliable performance both on and off-road. Great upgrade!

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Product Q&A

What makes the Allison AT545 transmission special?

The AT545 is known for its rugged reliability in medium-duty vehicles. It’s like the trusted workhorse that keeps on going, shift after shift.

Is the AT545 good for towing heavy loads?

While it’s great for urban deliveries and school buses, heavy towing might push its limits. Think of it more like a dependable daily driver than a heavyweight champ.

Can you upgrade to an AT545 for better performance?

Sure, there are mods out there to tweak its shift points and efficiency. It’s like giving your old faithful a boost without losing its core reliability.

How noisy is the AT545 transmission?

It’s surprisingly quiet for its size. Think of it as the silent partner in your vehicle’s operation, keeping things smooth without making a fuss.

What’s the maintenance like on the AT545?

It’s straightforward—regular fluid checks and changes keep it happy. Think of it as giving it a good spa day to keep it running smoothly for the long haul.

Does the AT545 have an overdrive?

Nope, it’s a four-speed without that extra kick. It’s like cruising comfortably on the highway without needing to shift into a higher gear.

Can the AT545 handle stop-and-go traffic?

Absolutely. It’s designed for urban environments, handling those frequent shifts and starts like a pro. Think of it as the commuter’s dream transmission.
allison at545 transmission for sale
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