Allis Chalmers Parts Serial Numbers / Data - Serial Number is Stamped into rear housing near brake cover.WD engine has plate bolted on right side covering push rods. WD45 engine is all cast with no plate.Late WD's and all 45's have curved shift lever.TractorSerial #'sYearDrawbar HPPTO HPDisplacementDry WeightRear Wheel sizeFront WheelWD.1x28 spinout.
Serial Number is Stamped into rear housing near brake cover. WD engine has plate bolted on right side covering push rods. WD45 engine is all cast with no plate. Late WD's and all 45's have curved shift lever.
On the lower left side of blower housing facing out, you will find these these numbers stamped in 2-01 64XXXXX stamped in. 64 is an example of the the date code. It changed with the year. First two digits is year 64, next two month 01, January and 15 the date.
![Allis Allis](http://www.tractordata.com/photos/F000/11/11-td3serial.jpg)
The last digit is for the assembly line which should be 1 as they only had one line putting them together. The best guess for time of manufacture for the tractor is about sixty days after the engine was built. The engines built late in the year would go to the next tractor model year.