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yo, Good Q!; Ford used to list them & info in Reman Eng & Tranny catalog but prob del it bec of the age of our Broncos..

One source I think can help better than I is thePUNISHER (Paul); he poss here a lot and has great info.

Ford Part Number Break-out & Casting Number 89-98 & 99-06
Source: by Roy B at
In the September 2003 installment of "PERA Core Corner," I provided both information and a chart to help with Ford casting and part numbering identification. I mentioned that the center portion of every Ford part number includes an identifier number, which indicates what that component part is. I also stated that I was unaware of any directory to those numbers.

Well, thanks to alert reader Lee Capps, Jr. from Carrollton, TX, who provided a list and pointed me in the right direction, I was able to investigate and complete another part of the "Impossible Mission" as it was referred to in that article.

To get the real flavor of the history you have to go to the beginning, as it was explained to us. Back when Henry Ford first introduced the "Horseless Carriage" onto the scene he quickly realized that parts for repairs would be needed.

Of course since there was no real network of dealerships and/or service facilities in place, Mr. Ford understood that development of a numbering system that would identify components would be extremely helpful. That way the blacksmiths (did you catch that?) and backyard (or more affectionately known "shade tree") mechanics who worked on these cars could get a handle on being able to order the parts they would need.

So Henry Ford himself designed what is still called the Ford Basic Part Number (BPN), those four or more digits in the center of Ford part numbers that tell all. Yes, the same numbers that were called the "identifier number."

Here is where it began: Wheels are 1000 numbers and Brakes are 2000, Front Axle 3000, Rear Axle 4000, Frame 5000, Engine 6000, Transmission 7000, Radiator 8000, Fuel System 9000 and Electrical 10000. But wait, the number will identify even further than that: even numbered BPNs are used on the right hand or passenger side of the vehicle, and odd numbered BPNs are on the left hand or driver’s side of the vehicle. So it began, the foundation upon which everything we see today has been built.

If you’re ever going to understand Ford’s numbering system you have to realize that there are three unique and separate components: the PREFIX, the IDENTIFIER NUMBER and the SUFFIX. Sounds simple but what would a Mission: Impossible be without some confusion? Guess what? There are two distinctly unique yet similar identification numbering systems: first, 1950 thru 1998 and second, 1999 thru 2028.

Ford Production Part Identification Coding
The PREFIX will tell us when the part was originally released by engineering production, what car line it was released for (but not always exclusive to), and by what engineering group. The earlier 1950 through 1998 prefix breaks down like this: First position is the decade; the second position is the year of that decade; the third is that vehicle application; and lastly, the fourth position indicates the engineering group (see example 1, F6AE in the chart on page 21). So "F" tells us that it is in the 1990-’99 decade, "6" tells us that it is 1996, "A" says that it is a Ford but does not narrow it down to any specific vehicle application and, lastly, the "E" tells us that it is from the Engine Engineering group.

The number system adopted in 1999 works out a little differently. The first position provides the actual year definition. The next two digits provide the vehicle application and the fourth digit the engineering group. Again, see example 2, XR3E in the chart. The letter "X" tells us that it is 1999; "R3" that it is a Mustang (once again not always exclusive to); and the "E" Engine Engineering, Dearborn.

The IDENTIFIER NUMBER, which is composed of the four digits in the middle, identifies the part, component or assembly. For example, 6049 indicates a cylinder head, 6250 would be a camshaft and 6009 would be a short block assembly. Unfortunately, I have not seen or found a directory of those numbers so they are something that you learn as you go along. These numbers are the same for all years so there is no difference between the earlier and later designators.

The SUFFIX is designed to tell us the engineering change level. Typically, "A" would mean the original status of the part, then going through the alphabet except for the letter "I" (so as not to be confused with one) as engineering changes occur. If more are required they will run the alphabet a second time AA, AB, AC and so on.

So how does that help with anything that has to do with casting numbers? Nearly all the time the prefix digit will be used in the casting number. However, it rarely, if ever, changes as often as a part number. So you could have an XL3E casting number, 4.6L Ford, PI cylinder head used in both light truck and Mustang; the part numbers may reflect differently but the head castings are the same. What these charts will do is give you a good foundation identifier that you can build upon with other resources. This chart is just one of many tools that help you in the identification process. Is it all the answers? Not at all, but it is a great help in sorting out what seems to be an impossible numbering system to understand. Now that you know how it works you should have much better insight into looking at Ford casting numbers as well part numbers.

Special thanks to David Struck from Baseline Automotive and to Bob Hansen from Industrial Irrigation for insights and assistance.

Overview & Legend
Source: by

Some other Auto Tranny ID info I have is:

Identification; "...If the shifter has a P-R-N-OD-D-1 pattern, the transmission must be an AOD (applicable to 1980-1993 vehicles). If a 1989-1993 truck has an Overdrive Cancel Switch and a P-R-N-OD-2-1 shifter pattern, then it is equipped with an E4OD transmission. 1994 and later vehicles with four speed automatic transmissions will all have an Overdrive Cancel Switch and a P-R-N-OD-2-1 shifter pattern, but may have either an E4OD or a 4R70W transmission. All 4.2L, 4.6L and some 5.0L engines use the 4R70W transmission, while diesel, 4.9L, 5.4L, 5.8L, 6.8L and 7.5L vehicles always use E4OD’s. You can measure the transmission fluid pan to determine which transmission you have if identification information is not available. A 4R70W transmission pan has an overall length of just under 15 inches, while an E4OD pan is much larger, measuring about 20 inches in overall length..."
Source: by Baumann Electronic Controls, LLC

For the E4OD; The identification tag for the E4OD transmission is located on the left hand side of the transmission case just behind the Transmission Range (TR) sensor



AOD ID Tag is located on the driver's side on the lower bolt that attaches the tailshaft to the transmission body. This tag contains many numbers; however, the first three-letter code on the top of the tag will say PKA
PKA...Transmission model
EA1...Service I.D. level
116009...Serial number
C21... Build date C/month..21/day (March 21st)
E9AP EB...Assy part number Prefix/suffix..
Casting #s; passenger cars had an E0AP casting, and the shorter truck castings read F2TP. The longer tail shafts had an E0LP casting on the passenger cars and an E0TP on pickups.
also, see
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