Number Lookup | Allison Transmission Serial

Allison’s warranty is tied directly to the serial number, not the vehicle VIN. If you cannot provide the transmission serial number, the warranty claim will be rejected immediately.

A precise lookup is essential because identical-looking transmission models often have internal hardware or programming variations that make them non-interchangeable.

Older electronic transmissions often used a 10-digit format starting with the plant code: Allison Transmission Serial Number Lookup

On many Allison identification tags, a date of manufacture number is also present. This number typically follows a format such as "05J12," which decodes to November 12, 2005. The letter corresponds to the month (A = January, B = February, C = March, D = April, E = May, F = June, G = July, H = August, I = September, J = October, K = November, L = December), and the numbers represent the day and year.

Call a local OEM truck dealer (Freightliner, International, Kenworth, etc.). If the transmission is original, their database can pull the build sheet containing the Allison S/N. Allison’s warranty is tied directly to the serial

Visit the official or Allison Parts Catalog website.

If the metal tag is missing, painted over, or damaged, you can find the number via: Older electronic transmissions often used a 10-digit format

Mechanics need the serial number to flash the correct Tuning Control Module (TCM) data. 2. Where to Find the Serial Number

inside the operator’s cab or on the vehicle’s original build paperwork. Physical Format