Allison Transmission Serial Number Lookup

Typically found on the right-rear or right-front side of the main case.

of the transmission. It is often positioned on the lower rear face of the rear housing. : An Allison serial number typically contains What to Look For : The serial number is usually listed directly below the model number on the bottom left of the data plate. Secondary Locations : You may also find it on the Vehicle Identification Plate

Once you have successfully located and copied down your 10-digit serial number, you can perform a lookup using official factory channels to pull your unit's build sheet. Method 1: The Official Allison Transmission Customer Portal Allison Transmission Serial Number Lookup

If you are working on an older AT, MT, or HT series transmission (common in classic RVs and vintage commercial trucks), the serial number may look different:

Complete Bill of Materials (BOM) detailing every internal gear, clutch pack, and valve body calibration used. Why the Assembly Number (A/N) Matters Just as Much Typically found on the right-rear or right-front side

: Access to official technical specs and build records in one spot.

For potential buyers of used commercial vehicles, obtaining the transmission serial number before purchase is highly recommended. With the serial number, you can verify: : An Allison serial number typically contains What

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.