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https://www.gates.com/us/en/ymm/search/landing/vin
This is the infamous "Gates VIN decoder". Gates uses it to try to sell you stuff for your truck. The rest of us use it to figue out what we can about a bus or truck chassis from its VIN.
You appear to have a:
Manufacturer International/Navistar
Model Year 2001
Model RE
Engine Series International/Navistar T444 Diesel Engine
Capacity V-8, 7.3L (444CID)
Fuel Type Diesel
Vehicle Details RE3000 - School Bus
Drive Line Type Type D (rear engine) 4X2
Brake System Air
GVWR Class Class 8: 33,001 - 55,000lbs.
Country US Produced Incomplete Bus Assembly
Plant Conway, Arkansas