Allison Transmission Serial Number Lookup [patched] Link

Closing recommendation

: Look for a metal data tag (usually silver or black) riveted to the side of the transmission housing. Allison Transmission Serial Number Lookup

If you cannot access the online portal, the first few digits of the S/N often identify the product family: Dartco Transmission Serial Number Starts With Transmission Series 631, 632, 9308 1000 / 2000 Series 651, 652, 9307 3000 Series 661, 662, 943 4000 Series AT500 / AT1500 Series MT600 Series HT700 / CT700 Series 4. Backup Identification Methods If the tag is missing or unreadable: VIN Lookup: Closing recommendation : Look for a metal data