Where is the frame number located on a truck?

[DeKhloe]

Truck frame numbers are typically located on the frame beneath the driver's cab. Trucks generally feature a body-on-frame design, meaning they have a chassis frame where the frame number is stamped at the front. The frame number refers to the Vehicle Identification Number (VIN) listed on the vehicle registration certificate. The VIN is a 17-character alphanumeric code, also known as the 17-digit identification code. Through its unique combination of letters and numbers, the VIN ensures that no two vehicles of the same model will have identical numbers within 30 years, providing each vehicle with a distinct identifier—essentially serving as the vehicle's ID card. The VIN follows specific rules: the characters O, Q, I, and 0 are illegal, and the letter Z is also invalid when used in the year position. The ninth character must be a digit from 0 to 9 or the uppercase letter X. The following four characters must all be digits and cannot be letters.