If the model number is worn off or unreadable, the first few digits of the serial number can often identify the transmission series: Transmission Series Common Serial Number Prefixes 1000/2000 Series 631, 632, 9308 3000 Series 651, 652, 9307, 6510 4000 Series 661, 662, 943, 6610 AT500 / AT1500 MT600 Series HT 700 Series Why You Need the Serial Number Locate Allison Transmission Serial Number
Older electronic transmissions often used a 10-digit format starting with the plant code:
Look for a rectangular plate, typically colored silver, black, or blue. It contains the model number, serial number, and assembly part number. Common Tag Locations Allison Transmission Serial Number Lookup
Connecting Allison DOC (Diagnostic Optimized Connection) software to the vehicle’s OBD/diagnostic port will read the serial number directly from the TCM. 2. Anatomy of an Allison Data Plate
The tag contains both the model number and the serial number. The serial number is typically a 10-digit code listed at the bottom left of this plate. If the model number is worn off or
The serial number is found on the (data tag) located on the exterior of the transmission housing.
Right-hand (passenger) side of the case, midway back, just above the oil pan rail. Heavy-duty construction, fire apparatus, severe-duty trucks The serial number is found on the (data
Right-hand or left-hand side of the main case, stamped directly into a flat machined boss. Alternative Lookup Methods
: Denotes ratio coverage (0–3 for close ratio; 7–9 for deep ratio).
: Mechanics need the number to find correct wiring diagrams, torque specifications, and fluid capacities.
Right-hand (passenger) side of the main housing, near the rear extension housing. Garbage trucks, dump trucks, regional haulers, motorhomes