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On newer models, you may see a separate code called the . This is essentially the "part number" for that specific transmission assembly. If you are rebuilding a transmission, the PLN is often just as important as the Serial Number.
The serial number is stamped on a metal data plate fixed to the transmission housing. The location of this plate changes depending on the transmission generation and series. On Highway Models (1000, 2000, 3000, 4000 Series) Allison Transmission Serial Number Lookup
Older serial numbers often start with letters denoting the manufacturing plant or series architecture (e.g., prefixes starting with BK , DA , or 00 ). On newer models, you may see a separate code called the
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