Allison Transmission Serial Number Lookup May 2026

The most reliable way to identify your transmission is to locate the (nameplate) attached directly to the transmission housing.

Typically found on the passenger side (right side) of the transmission. Allison Transmission Serial Number Lookup

On older or specific vocational models, the tag may be on the lower rear face of the rear housing or near the bellhousing. The most reliable way to identify your transmission