The serial number format typically looks like:
If the online portal is down or your serial number is from an older legacy unit, call an authorized Allison Transmission distributor or dealer. Provide them with the 10-digit number, and they can pull up the complete factory build sheet from their internal database. Step 3: Check Vehicle Manufacturer (OEM) Portals
Navigate to the section and select MyAllison or the public Serial Number Search tool. Allison Transmission Serial Number Lookup
If the tag is completely missing, look at the transmission casting itself. Allison often stamps the serial number directly into a machined flat pad on the metal housing, usually right next to where the tag was originally affixed. Step 2: Reading the Identification Tag
Finding and decoding your Allison transmission serial number is the fastest way to get the correct replacement parts, verify warranty coverage, and access accurate service manuals. Because Allison builds transmissions for heavy-duty trucks, RVs, buses, and commercial vehicles, precise identification is critical. 1. Why the Serial Number Matters The serial number format typically looks like: If
Allison Transmission maintains a customer support line.
If you own a heavy-duty truck and a Nexiq USB-Link, you likely have Allison DOC. If the tag is completely missing, look at
The serial number had just exposed a lie. The transmission was original, not rebuilt. Marco walked away from the deal.
Look on the passenger side (right side) of the transmission case toward the rear.
Summary (quick takeaway)
Located on the driver side (left side) of the oil pan or just above the oil pan rail on the main housing.
