Allison: Transmission Serial Number Lookup [patched]

A mechanic rebuilds a 4000 series and orders a new torque converter by visual inspection. Problem: The converter doesn't fit. Solution: Look up the Serial Number. The build sheet shows this specific unit was a special order for a fire truck with a different flex plate mounting depth. Without the lookup, they would have forced the incorrect converter, damaging the pump gear.

To ensure accurate and efficient Allison transmission serial number lookup: Allison Transmission Serial Number Lookup

: The 10-digit serial number, typically found on a metal data plate on the passenger side (lower rear face) of the transmission, is the primary key for looking up exact model specs. A mechanic rebuilds a 4000 series and orders