The locations of vehicle identification numbers (VIN) vary but the following are the common places to find them:
Firewall of the vehicle
Radiator Support Bracket
Dash by windshield
Left hand inner wheel arch
Steering column
Guarantee & Maintenance Book
Machined Pad on front of engine
Drivers door or post on passenger side
Component parts as listed above -e.g.- engine, frame, etc.
Later model years most common locations of the VIN:
Left instrumentation panel
Dash plate by window
Drivers door or post
Firewall
On your sierra, i believe there is a vin stamp on the out side of the frame rail, can't remember which side right now and one in the engine bay.
