Decoding Ford part numbers

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Originally posted Joshua Teixeira, cleaned up by John Witherspoon, cleaned up further for Wiki format by Jon Heese:

For Example: F4DZ-2B120A -- a RH brake caliper

    F is 1990 (E is 80's, D is 70's, C 60's, B is 50's, A is 40's) 
    4 is the year within the decade that the part first was installed by Ford, so an F4 part was first used on 1994 model year cars 
    D is the line of car:
         A is full size Ford 
         B is Fairlane/Torino to 76, then 77-79 LTD II, then Festiva, then Aspire 
         C is Mercury Capri (60's - 70's), Escort 
         D is Maverick, Granada, Taurus, 96 and later Taurus/Sable common parts 
         E is Escort 
         F is common Tempo/Escort parts (same parts, different body panels) 
         G is Mercury Montego, Monarch 
         H is Ford heavy truck 
         J is marine (boat engines, stationary power plants) 
         K is Tracer 
         L is Lincoln Mark series and regular 4-door Lincoln 
         M is full size Mercury for unique parts (otherwise, use A) 
         N is Ford tractor 
         O is Mercury Montego, Sable, and Lincoln Continental 
         P is Bobcat and Pinto 
         R is Merkur, then Contour/Mystyque 
         S is T-bird 
         T is light truck, Bronco, Explorer 
         U is Econoline can 
         V is Lincoln Town car 
         W is Cougar 
         X is Villager 
         Y is Lincoln or Mercury/Lincoln non-vehicle-specific part 
         Z is Mustang or Ford non-vehicle-specific part 
         2 is Probe 
         3 is Tempo 
         4 is 96+ Sable body parts 
         6 is Topaz 
         7 is Ranger 
         8 is Windstar 
         9 is Aerostar 
    -2B120 is the basic part number and is the number for the caliper.  If part of a pair, then the lower number is the right hand side (i.e. 120 is right, and 121 is left).  The only exception is power window motors that fit only one car model-- they are numbered the other way around.  Series means the 1000, 1001, ..., 1999, 1A001, to 1Z999 where every basic part number is a unique part on a car, and the same part "name" for a different car is differentiated by the prefix.
    1000-2000 series are wheels and brakes 
    3000 series are front suspension and steering 
    4000 series are rear axle and drive axle 
    5000 series are frames front stabilizer and rear suspension 
    6000 series are engine parts 
    7000 series are MTX transmission and clutch, A7000 series are ATX transmission 
    8000 series are cooling and grille 
    9000 series are fuel 
    9500 series are carburetor 
    10300 series and up are generator, alternator, starter, distributor 
    13000 series and up are lamps, wiring, and electrical except for 10300 series 
    16000 series and up are fenders and hood 
    17000 series and up are speedometer and associated parts 
    17500 series and up are bumpers, jack, mirrors, washer/wipers, speedo cables 
    18000 series and up are air conditioning, heaters and radios 
    00000 series are body front (door posts and ahead and floor pans) including instrument panel and dash, but not gauges 
    23000 series and up are body sheet metal and exterior rubber bits 
    40000 series and up are back half of the car (trunk, roof racks, T-roof etc) 
    50000 series and up are exterior mouldings, emblems, and nameplates 
    60000 series and up are seats 
    70000 series and up are doors, windows, (not windshield), seat trim/covers 

Japanese weird parts use 2-piece Mazda part numbers. No further information is available on those here.

Note that if your '96 car has a part number such as F4DZ-2B120A, then you know the part was first used on '94 cars, was installed on '95s and is still being used unchanged on '96s.

Part numbers are not necessarily the same as casting #'s or the numbers on the part. Line numbers are different still.