The most common Mopar Date Codes are the 4 digit Julian Perpetual Day Calendar. The first 3 numbers are the day of the year and the last number is the year.
Example: 2979 would be the 297th day of 1969 = Oct 24th, 1969. Typically production Model Years for Cuda’s & Challenger’s would be from August 1st to July 31st.
Barracuda & Challenger parts that use the 4 digit Date Code: K-Frame, Seat Tags, Master Cylinder, Power Steering, Wiper Motor, Holley Carb, Carter Carb ID tag, AC Dryer, Hoses, Radiator Support Bracket, Hood Catch , Hood Latch, Emergency Brake, Radio, Key Buzzer Switch, Power Steering Pulley, Power Steering Hose, Heater Blower Motor, Fuel Relay, Radio Crossover, Speedo, Dash Cluster Housing, Tach, Power Steering coolers, Heater Box, Speaker, Rear End, Intake, Heads Dimmer Switch, Fuel Sender, AC Clutch, Cylinder Heads and many more.
