A Farmall tractor serial number is stamped into a plate on the steering gear housing. This aluminum plate is located on the right side of most Farmall tractors. Each model year has its own series of numbers to help customers determine the age of their tractors.
The engine serial number may be required when ordering parts for the tractor's engine. Look for a stamped number on a flat portion of the cylinder block. The engine serial number should be similar to the tractor serial number, but slightly higher in the same series of numbers. The stamp is typically located on the tractor's left side, under the valve tappet cover.