1991 Thomas Built Model 3975
Decoded identity
From the 17-character VIN via NHTSA vPIC
- VIN
- 1T7N45922M1443720
- Make
- Thomas Built
- Model
- Model 3975
- Model year
- 1991
- Body class
- Bus - School Bus
- Vehicle type
- BUS
- GVWR
- Class 8: 33,001 lb and above (14,969 kg and above)
- Decoded at
- Jul 26, 2026
Decode evidence & sources
Deterministic structure
These fields come directly from VIN positions and the published checksum calculation, with zero store IO.
Position 10 repeats every 30 years; both candidates are retained and neither is silently selected.
Deterministic · positions 12–17 for a North American WMI.
Sourced platform inference
The prefix store publishes only at support ≥ 3 and purity ≥ 90%. Prefix confidence is shown beside every established platform claim.
No supported platform claim is established for this prefix
The resolver answered successfully but returned no row above the evidence floor. This does not mean the vehicle has no platform or that no data exists; it means this store cannot make the claim.
Federal observation (NHTSA vPIC)
What the federal corpus observed directly for this exact VIN — independent of, and sometimes more specific than, the prefix-level inference above.
Observed directly for this VIN via NHTSA vPIC.
Observed directly for this VIN via NHTSA vPIC.
Observed directly for this VIN via NHTSA vPIC.
Observed directly for this VIN via NHTSA vPIC.
Observed directly for this VIN via NHTSA vPIC.
Observed directly for this VIN via NHTSA vPIC.
Not established
- platform make
- platform model
- model line
- generation
- cab type
These are withheld claims, not negative findings.
Inspection history
Every roadside inspection of this VIN, newest first · Mar 18, 2024 – Mar 11, 2026
Carriers this unit has run under
1 distinct carrier · grouped by DOT · newest activity first
Plate & unit-number history
The same truck under different plate registrations across carriers