The serial number is usually listed on the bottom left of the plate, directly beneath the model number.

Entering the serial number on the Allison HUB provides access to the "As-Built" configuration of your transmission, ensuring you order the correct filters, gaskets, or internal components.

An Allison Transmission serial number is more than just a string of characters; it is the "genetic code" for your transmission. Because Allison transmissions are highly modular and used in everything from fire trucks to school buses and military vehicles, looking up the serial number is the only way to ensure you get the right parts.