The Allison AT545 transmission is a non-electronic, fully hydraulic, 4-speed automatic transmission designed for medium-duty applications. Its robust construction ensures unmatched reliability and durability, making it an excellent choice for school buses, delivery trucks, motorhomes, RVs, refuse trucks, shuttle buses, and other vocational vehicles. Unlike manual transmissions, the AT545 eliminates the need for a clutch pedal, offering smoother shifts and reducing driver fatigue, a crucial factor for long-haul journeys or urban routes that require frequent stops.
When searching for an Allison AT545 transmission for sale, it's essential to consider its remarkable adaptability. With features like torque multiplication through its torque converter and a hydraulically controlled valve body, this transmission seamlessly adjusts to various driving conditions. Moreover, its straightforward design minimizes maintenance costs and downtimes, key aspects that fleet managers will appreciate.
Why "Non-Electronic" Matters
The AT545 is part of Allison's older, fully-hydraulic medium-duty transmission family. Unlike modern Allison transmissions (1000, 2000, 2500, 3000 series with full electronic control modules), the AT545 has no transmission control module (TCM), no electronic shift solenoids, and no diagnostic codes. The valve body, governor, and torque converter operate purely on hydraulic pressure principles.
This is a significant advantage for several buyer segments:
The Allison AT545 transmission is renowned for its reliability and durability, making it a prime choice for commercial and medium-duty vehicle operators. One of the standout features of this transmission is its fully automatic operation, which significantly reduces driver fatigue and enhances ease of use. With no need for manual shifting, operators can maintain their focus on navigating traffic or difficult terrains, minimizing accidents and boosting overall productivity.
Another key feature is its robust torque converter with lock-up capability (on later production AT545 variants). This design improves fuel efficiency and ensures smoother power delivery across all driving conditions. Additionally, maintenance costs are kept low due to its simplified yet sturdy construction. Fewer moving parts result in less wear and tear over time.
| Vehicle | Compatibility |
|---|---|
| School Buses | Full-size Type C / Type B school bus applications, particularly those built on Ford / GM / International cutaway chassis |
| Shuttle Buses | Hotel, airport, and campus shuttle bus fleets |
| Motorhomes / RVs | Class C, Class C+, and smaller Class A motorhomes (particularly on Ford E-Series and Chevrolet / GMC C-Series chassis) |
| Delivery Trucks | Light medium-duty cargo and box trucks |
| Refuse Trucks | Smaller refuse / waste management vehicles |
| Vocational Vehicles | Various commercial and municipal applications requiring reliable medium-duty automatic transmission |
| Item | Details |
|---|---|
| INCLUDED | Complete AT545 transmission case with internal valve body, gears, torque converter (typical), shift mechanism, governor, all internal components for full hydraulic operation. |
| NOT INCLUDED | Driveshaft, transmission mount, shift cable / linkage, dipstick assembly, external cooler lines, transmission cooler. |
| Fluids | Drained before shipping. Refill with ATF Dexron III or equivalent (12 to 15 quarts). |
| Core Note | No core charge. You are not required to return your old transmission. |
The AT545 fits a wide range of medium-duty vehicles:
| Vehicle | Compatibility |
|---|---|
| Ford E-Series Cutaway Chassis | E-350, E-450 motorhomes, shuttle buses, school bus chassis |
| Chevrolet / GMC C-Series | Medium-duty truck applications |
| International / Navistar Bus Chassis | Type C school bus applications |
| Freightliner FS-65 | School bus chassis |
| Various RV / Motorhome Manufacturers | Class C and Class C+ motorhomes built on Ford / Chevrolet / GMC cutaway chassis |
| Heavy-Duty Vans and Cargo Vehicles | Light medium-duty commercial applications |
Bellhousing pattern compatibility varies by donor application. Confirm your specific chassis bellhousing pattern before ordering.
Every used Allison AT545 we ship goes through this process:
Where mileage is verified, it is shared. Most AT545 cores have 100,000+ miles in school bus or motorhome service, which is typical for an engine designed for 200,000+ miles before major service.
| Type | Automatic Transmission | fully hydraulic (NON-electronic) |
|---|---|
| Model | AT545 |
| Maker | Allison Transmission |
| Speeds | 4-speed |
| Torque Rating | Up to 550 lb-ft |
| Gear Ratios | 1st: 3.49:1 | 2nd: 1.86:1 | 3rd: 1.41:1 | 4th: 1:1 | Reverse: 3.06:1 |
| Overall Length | 31.5 inches |
| Fluid Capacity | 12 to 15 quarts |
| Fluid Type | Automatic Transmission Fluid (ATF) | Dexron III or equivalent |
| Input Shaft | 10 spline | 1.25 inch diameter |
| Output Shaft | 16-spline | 1.50 inch diameter |
| Weight | 320 pounds without fluid |
| Compatibility | 2000 Allison AT545 transmission |
| Price | Call for Quote |
Every used Allison AT545 transmission sold by Vaz Auto Solutions is covered by a 15 day replacement warranty from the date of delivery.
To file a claim, contact us within 15 days of delivery at (240) 301-0095 or support@vazautosolutions.com.
