General Ford Part Number decoding
For general reference only

Example: #

 D1AF-9510-DA
B 1B 23

First Line
D1AF-DA

 Decade produced
 B = 1950's
 C = 1960's
 D = 1970's
 E = 1980's
 F = 1990's

D1AF-DA

 Year produced
 1 = 1971
 2 = 1972
 3 = 1973
 ETC.
D1AF-DA Model , These do not always apply years 1940-1997

A= Ford Full size Ford / LTD,Galaxie
O= Fairlane/Torino to 76, then 77-79 LTD II, then Festiva, then Aspire
C= Mercury Capri (60's - 70's), Escort
D= Falcon, Maverick, Granada, Taurus
E= Escort
F= Foreign, Trans-Am Racing
G= Comet (later Montego)
H= Holman/Moody HiPo part Ford heavy truck
J= marine (boat engines) Industrial
M= Mercury
N= Ford tractor
O= Mid size Ford Fairlane (later Torino)
P= Replacement Part Autolite (later Motorcraft Bobcat Pinto)
R= Rotunda Merkur
S= Thunderbird
T= Truck Bronco, Explorer
U= Bronco , Econoline Van
V= Lincoln
L=
W= Cougar
X= Villager
Y= Lincoln or Mercury/Lincoln non-vehicle-specific part
Z=Mustang or Ford non-vehicle-specific part
2= Probe
3= Tempo
4=
5= Expedition
6= Topaz
7= Ranger
8= Windstar
9= Aerostar
D1AF-DA 
Design 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
9510 Sections in the Master Parts Catalog
Most companys do not use this when looking up carbs and kits
6905 - 6968         Transmission Overdrive
7000 - 7997         Transmission (Automatic or Manual) and Clutch
8000 - 8499         Radiator and Grill
8500 - 8689         Water Pump and Fan
9002 - 9296         Fuel Tank
9301 - 9420         Fuel Pump
9421 - 9499         Manifolds, Clamps
9500 - 9599         Carburetor
9600 - 9699         Air Cleaner
9700 - 9999         Accelerator and Choke Control Rods
D1AF-DA Design Revisions
A or AA first design, then AB, AC, AD, etc.  BA or CA would be a part that was the same function as the AA but slightly different 
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