A fleet manager searches serial 6510823456 and discovers the transmission was originally built for a 2019 International HV607 with a 3000 HS (high-speed) output. Without this lookup, they would have ordered a standard 3000 output shaft seal—which would leak immediately.

The serial number typically consists of and is usually listed directly below the model number on the data plate. Leading digits often indicate the transmission series: 1000/2000 Series : Starts with 631, 632, or 9308. 3000 Series : Starts with 651, 652, or 9307. 4000 Series : Starts with 661, 662, or 943. AT500/1500 Series : Starts with 321 or 9108. MT600 Series : Starts with 241 or 242. HT/CT 700 Series : Generally starts with 251. 3. How to Perform a Lookup

A unique sequential production number assigned chronologically on the assembly line. Legacy Formats (Older Models)