If you don't have the number ready, you can find it physically on the unit: : Look for a metal data tag (nameplate) on the passenger side or the lower rear face of the transmission housing. : It is typically a 10-digit number listed just below the model number. Other Sources
If you are buying a (Remanufactured) transmission, use this specific link: Link: https://www.allisontransmission.com/parts-service/reman/warranty-registration allison transmission serial number lookup link
software to download the correct calibrations from the PCCS web server. Allison Transmission Understanding Your Model If you don't have the number ready, you
If you need to identify the model, configuration, parts, or service history for an Allison transmission, the is your best resource. Allison Transmission Understanding Your Model If you need
: Use the Warranty Status Check tool to see if your unit is still under coverage or has registered extended coverage.