If you work in the heavy-duty trucking, bus, or equipment industries, you know that is a gold standard. But whether you are a fleet manager, a diesel mechanic, or an owner-operator looking for a replacement part, the single most important piece of information about your vehicle is the serial number .
"Retarder equipped," Renny laughed, a dry, gritty sound. "That’s why the scanner couldn't talk to it. Someone dropped a heavy-duty transit transmission into a light-duty work truck. The protocol is different." allison transmission serial number lookup link
| Serial Number Prefix (First 3 chars) | Typical Model Series | | :--- | :--- | | B66, B67, B68 | 1000/2000 Series (5-speed) | | C93, C94, C95 | 3000 Series (6-speed) | | X12, X13, X14 | 4000 Series (7-speed) | | 69xxxxx (Legacy) | HT700 or MT600 Series | If you work in the heavy-duty trucking, bus,