General Ford Part Number decoding
For general reference only

Example: #

 D1AF-DA
B 1B 23

First Line
D1AF-DA

 Decade produced
 B = 1950's
 C = 1960's
 D = 1970's
 E = 1980's

D1AF-DA

 Year produced
 1 = 1971
 2 = 1972
 3 = 1973
 ETC.
D1AF-DA Model , These do not always apply
  A=Ford Full size Ford / LTD,Galaxie
  C=Truck
  D=Falcon , Maverick
  E=Explorer
  F=Foreign, Trans-Am Racing
  G=Comet (later Montego)
  H=Holman/Moody HiPo part
  J=Industrial
  M=Mercury
  O=Mid size Ford Fairlane (later Torino)
   P=Replacement Part Autolite (later Motorcraft)
   R=Rotunda
   S=Thunderbird
   T=Truck
   U=Bronco , Econoline Van
   L , V=Lincoln
   W=Cougar
   Z=Mustang
D1AF-DA 
Department
 A=Chassis
 B=Body
 E=Engine
 F=Engine Accessories
 J=Autolite
 M=Holman Moody
 P=Auto Transmission
 R=Manual Transmission
 W=Axle
 X=Muscle Car Parts
 Y=Lincoln/Mercury Service Parts
 Z=Service Parts
D1AF-DA  - ?? If any one knows E-Mail Me
B 1B 23 Design changes
Second Line
B 1B 23		 4 Letter Date Code
Year Code
 1 = 1971
 2 = 1972
 3 = 1973
 ETC.
B 1B 23 Month of Date Code  
A = Jan
B = Feb
C = Mar
D = April
E = May
F = June		 G = July
H = Aug
J = Sept
K = Oct
L = Nov
M = Dec
B 1B 23 Day of Month
23rd day of the month
Example
1BF		 3 Letter Date Code
Year Code
 1 = 1971
 2 = 1972
 3 = 1973
 ETC.
1BF Month of Date Code  
A = Jan
B = Feb
C = Mar
D = April
E = May
F = June		 G = July
H = Aug
J = Sept
K = Oct
L = Nov
M = Dec
1BF Week of Month
1 or A = 1st week
2 or B = 2st week
3 or C = 3st week
3 or D = 4st week
5 or E = 5st week