The first two or three digits often denote the manufacturing facility and assembly line configuration, while the remaining digits are sequential production numbers. Legacy Alphanumeric Format (Older Models)
Taking a few minutes to clean off your transmission case, locate the ID tag, and record your saves hours of frustration down the road. Whether you are performing a routine fluid swap on an Allison 1000 in a pickup truck or ordering heavy internal gears for a vocational 4000 Series dump truck, the serial number is your definitive key to accurate parts, reliable service, and certified factory data.
Older units may feature a combination of letters and numbers (e.g., BKXXXXXX or 01XXXXXX ).
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 Allison Transmission Serial Number Lookup
Allison transmissions have evolved through multiple generations of electronic controls. Terms you may encounter include WTEC II, WTEC III, 4th Generation Controls, and TransID levels. The TransID (Transmission ID) level helps identify which generation of electronic controls and internal wiring configuration your transmission has. The only difference between a pre-TransID transmission and a TransID 1 transmission is the internal wiring harness, which connects the digital and analog grounds on the TID 1 harness.
Visit the official website and navigate to the "Service" or "Parts" tab. Access the publicly available Serial Number Lookup Tool . Input your 10-digit number without spaces or dashes. What the official lookup provides: Exact model designation (e.g., 3000 EVS vs. 3000 RDS). Original ship date from the factory.
Allison has transitioned through a few serial number formats over the decades. Understanding your format helps ensure you copy down the right amount of digits. Modern 10-Digit Format (Current Production) The first two or three digits often denote
An authentic Allison data plate contains several crucial strings of alphanumeric characters:
💡 Pro tip: Take a photo of the tag before searching. Older transmissions may have faded numbers – use chalk or a flashlight to read them.
Mechanics need the S/N to flash the Transmission Control Module (TCM) with the correct software. 1. Where to Find Your Allison Serial Number Older units may feature a combination of letters
Provides historical build and shipment data, as well as warranty claim history. Allison Authorized Service Network:
Commonly found in Chevrolet/GMC HD pickup trucks and medium-duty box trucks. The tag is typically located on the passenger side (right side) of the transmission case, near the rear toward the tailshaft housing.
By using the Allison Transmission serial number lookup, you ensure that you are treating your equipment with the precision it requires, reducing downtime, and avoiding costly errors.
Allison’s warranty is tied directly to the serial number, not the vehicle VIN. If you cannot provide the transmission serial number, the warranty claim will be rejected immediately.
: Avoid costly shipping delays caused by ordering components that do not match your exact build configuration.