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Occasionally, the serial number is listed on the vehicle's secondary identification plate, often located near the cab or cowl.
Older transmissions, off-highway units, and specialized military models frequently use an alphanumeric format consisting of letters and numbers.
The plate is usually a metal tag (often blue or silver). The serial number is clearly labeled, often appearing just above or next to the model number. How to Use the Serial Number Allison Transmission Serial Number Lookup
When the unit officially entered service. 4. Decoding the Serial Number Structure
Several independent heavy-duty parts websites (like Weller Truck Parts or Midwest Transmission ) offer free serial number decoders. Occasionally, the serial number is listed on the
: Check the rear cover or right-rear side of the main housing.
If you own a heavy-duty truck and a Nexiq USB-Link, you likely have Allison DOC. The serial number is clearly labeled, often appearing
Alternatively, it may be on the or the lower rear face of the rear housing. Other Identification Areas :
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