If the online tool gives no results:

Closing recommendation

Allison has utilized two primary serial number formats over the last few decades. Modern 10-Digit Format (Most Common) Modern units use a purely numeric 10-digit string. 2410123456 24 or 65 : Represents the assembly plant prefix. Remaining digits: The sequential build order number. Legacy Alphanumeric Format (Pre-2000s)

Found on the passenger side near the rear accessory drive or PTO pad.

required for modern electronic control modules. Without this data, technicians risk installing incompatible parts that could lead to "limp mode" or internal damage. JustAnswer Allison HUB™ | Allison Transmission

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.

: Provides verification of a transmission's age and configuration before buying a used vehicle.

Internal valves, filters, and electronics vary by production year and assembly line.

Method 1: The Official Allison Transmission Parts Catalog (MyAllison)

(right side) of the transmission housing. It is typically located on a metal data plate or tag attached to the lower rear face of the rear housing. Alternative Locations : You may also find the serial number on the Vehicle Identification Plate

Commonly found in Chevy/GMC HD trucks and medium-duty box trucks. The tag is located on the passenger side (right side) of the transmission case, near the rear.

If the metal tag is missing (common in older units), the serial number is .