Looking at: 2002 IH 71 pass school bus T444 diesel motor Allison trans,
The man says it has a 2000 transmission and it is not a 545.
Allison Transmissionís 1000 and 2000 Series are rated up to a maximum of 224 kW (300 hp) and have up to six speeds available, including two overdrives. Both close and wide ratio gearing are offered. The addition of 5th Generation advanced electronic controls enhances operation and prognostics capability
Thanks in advance.
OOPS! I should have searched a bit more.
The Allison transmission series 1000, 2000 & 3000 are 5/6 speed automatics with overdrive. The differences of interest to skoolies are horsepower & torque limits. If it came in the bus with the engine, it's fine. These are generally the preferred automatics installed in school buses in the last 25 years.