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Most school buses were built with the Allison AT545 — a simple, reliable transmission designed for low-speed stop-and-go routes.
But for highway driving, towing, or long-distance travel, it quickly becomes the weak link.
Why Upgrade From the AT545?
The AT545 Has Major Limitations for Skoolies & Motorhomes
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No overdrive (high RPMs at highway speed)
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No lockup converter (runs hot, wastes power)
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Poor fuel economy
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Limited towing capacity
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Struggles on hills
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Not designed for extended highway use
These issues are WHY so many skoolie owners burn up transmissions, fight overheating, or feel their bus is “screaming” at 55–60 mph.
The AT545 Has Major Limitations for Skoolies & Motorhomes
-
No overdrive (high RPMs at highway speed)
-
No lockup converter (runs hot, wastes power)
-
Poor fuel economy
-
Limited towing capacity
-
Struggles on hills
-
Not designed for extended highway use
These issues are WHY so many skoolie owners burn up transmissions, fight overheating, or feel their bus is “screaming” at 55–60 mph.
The AT545 Has Major Limitations for Skoolies & Motorhomes
-
No overdrive (high RPMs at highway speed)
-
No lockup converter (runs hot, wastes power)
-
Poor fuel economy
-
Limited towing capacity
-
Struggles on hills
-
Not designed for extended highway use
These issues are WHY so many skoolie owners burn up transmissions, fight overheating, or feel their bus is “screaming” at 55–60 mph.
The Allison 1000/2000 Solves Every One of These Problems
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With true overdrive, a lockup converter, stronger internals, and electronic control, the Allison 1000/2000 is a night-and-day improvement over the AT545.
What You Get With Our Swap
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Lower cruising RPMs
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More power to the wheels
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Cooler transmission temps
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Better fuel economy
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Smoother, safer shifting
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Real towing capability
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Highway-ready drivability
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This is the transmission these buses should have come with from the factory.