This is a year-of-manufacture table for differentials. The first character is the decade, from 1940 to 1990, while the second is the year in that decade. So our example (C4AW-4025-B) was introduced in 1964.
Ford Part Number Third Character
(8.8- & 9-Inch Axle ID)
| Third Digit | Model & Year |
| A | Ford/Galaxie (1958 on) |
| B | Bronco (1970–73), Maverick (1975–77), Fairmount (1978–83) |
| C | Remanufactured Parts (1966–75), Elite (1975), Capri (1979 on) |
| D | Falcon (1960–69), Maverick (1970–74), Granada (1975–83), LTD (1983 on) |
| E | Chassis Cab Truck (1970–73), Pinto (1976–80), Escort (1981 on) |
| F | Export sales, Trans Am Racing |
| G | Comet (1961–67), Montego (1968–76), EXP (1982 on) |
| H | High Performance Part, Medium and Heavy Truck (1966 on) |
| I | Not used |
| J | Marine and Industrial Engines |
| K | Edsel (1958–60), Comet (1975–77), Zephyr (1978–83), Marquis (1983 on) |
| L | Lincoln (1958–60), Mark (1961 on) |
| M | Mercury (1958 on) |
| N | Tractor (1958 on) |
| O | Fairlane (1962–68), Torino (1969–76), LTDII (1977–79), LN7 (1982–83) |
| P | Autolite and 1962 on, Motorcraft Brand |
| Q | Not used |
| R | Rotunda Tools (1962–69), Ford of Europe (1970 on), Remanufactured parts (1976 on) |
| S | Thunderbird (1958 on) |
| T | Truck (1958–65), Light and Medium Truck (1966–82), Bronco (1966–70, 73–82), Light Truck and Full–Size Bronco (1983 on) |
| U | Econoline and Club Wagon Van (1961–81) |
| V | Lincoln Continental (1961–81) |
| W | Cougar (1967–80, 83 on), XR7 (1981–82) |
| X | Truck (1970–73) |
| Y | Meteor in Canada (1962–72), Bobcat (1975–80), Lynx (1981 on) |
| Z | Mustang (1964–73), Mustang II (1974–78), Mustang (1979 on) |
| 1 | Not used |
| 2 | Pinto (1972–75) |
| 3 | Tempo (1984 on) |
| 4 | Comet (1971–74), Monarch (1975–80), Cougar (1981–82), Marquis (1983 on) |
| 5 | RVs (1974–75), Continential (1982 on) |
| 6 | Pantera (1971–75), Topaz (1984 on) |
| 7 | Courier (1971–85), Ranger, Bronco II (1983 on), Explorer (1991 on) |
| 8 | Capri (1972–75) |
| 9 | Turbine Engine Parts (1970–75) |
The third character in our example (C4AW-4025-B) is an A, which indicates it is from a Ford vehicle, specifically a Galaxie from 1958 or newer.
Ford Part Number Fourth Character
(8.8- & 9-Inch Axle ID)
| Fourth Digit | Design Engineering Office |
| A | Light Truck Engineering Division |
| B | Body and Electrical Product Division |
| C | Chassis |
| D | Overseas Product Engineering |
| E | Engine North America |
| F | Electronics Division |
| G | Engine Merkenich Germany |
| H | Climate Control (1972 on) |
| I | Not used |
| J | Ford Parts and Customer Service Division |
| K | Import Release |
| L | Ford Customer Service Division Power Products |
| M | Performance and Special Vehicle Operations |
| N | Volvo |
| O | Outside |
| P | Transmission and Axle |
| Q | Diesel Engine |
| R | Manul Transmission |
| S | Light and Heavy Truck Special Order Parts |
| T | Electrical |
| U | Fuel and Handling Division |
| V | Domestic Special Order |
| W | Axle and Driveshaft |
| X | Plastic and Trim |
| Y | Special Vehicle |
| Z | Ford Service Parts, Product Analysis |
| 1 | European Product Development Center |
| 2 | Land Rover |
| 3 | Large and Luxury Vehicle Center |
| 4 | Truck Vehicle Center |
| 5 | South America Operations |
| 6 | Otomobil Sanayi, Turkey JV |
| 7 | Transmission and Axle |
| 8 | Hybrid and Electric Vehicle |
| 9 | Asia Pacific and Australia |
The fourth character represents the Engineering Operations area responsible for the component and to no surprise, the W in our example (C4AW-4025-B) represents Axle and Driveshaft Engineering.
The last character designates which Design Engineering Office is responsible for the component. There is a fair amount of detailed information contained within the part number for Ford components.
The differential is identified by a basic part number, but you may find an engineering part number, which is usually part of the casting, and a service part number, which is found on the parts box or found in the dealer parts system. Regardless whether it is the service part number or the engineering part number, the basic number remains the same. Keep in mind that sometimes an engineering part number was placed on the casting of a part that was used on a different vehicle. So, proceed with caution with this information because it only serves as a basic indicator.
The basic part number is a series of numbers systematically developed to further divide the vehicle into sub-systems. In fact, sub-assemblies or accessory kits often had a letter in the second position of the basic number. For example, the base number for shift level is 7213 while the indicator for the shift level is 7A213. The C-washers for axle retention are 4N237, axle brackets are 4A263, and even the differential bearing shims are 4A451.
Another set of basic numbers is reserved for body components and yet another set for service tools, but we are focused on the axle and driveshaft for the purposes of this book.
The last sequence of numbers or suffix provides revision control for the Design Engineer. Typically, the first revision was given the suffix A and then sequenced to B and so on as design revisions were made. The design revisions were typically very minor, and the parts were interchangeable but of course, you wanted the latest revision. If there were significant changes, the entire part number was updated. But there are exceptions to this as well. For example, the A revision could be an intake manifold for a 2-barrel carburetor, while the B revision could be the 4-barrel carburetor version of the same engine manifold.
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