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Author Topic:   Parts number confusion

Posts: 1315
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 12-23-2001 07:33 PM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
I'm confused about parts numbers. Here's the background ... questions follow. My car is early '68. My first parts car was a late '68. I'm now dismantling a '67 for parts. As you know, many Stang parts do not carry the actual Ford part numbers (C8Z etc.) but often carry other totally different numbers. I've found a bunch of parts on my car and both my parts cars which are identical, with the same non-Ford parts numbers (e.g., tail light buckets). Sooooo ...
1) What is the point of Ford giving an item a part number which is different from the actual number on the part?
2) Whenever my Osborn manual tells me a part has a C8Z number, does that mean there was a remachined NEW part that differs from the '67 part? I know Ford used old parts until they ran out sometimes, but like I say, the tail light buckets from my late '68 are identical in every way to the buckets from my '67, yet Osborn gives the '68 buckets a C8Z number.
Thanks guys, and have a great Xmas!

[This message has been edited by Fastback68 (edited 12-23-2001).]

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Posts: 30756
From: Saco, Maine
Registered: May 99

posted 12-23-2001 09:08 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I'll tell you the way I understand it and if I'm wrong someone {Alex? Ray? Rick?} can correct me...

1} The numbers you see in a Osborn manual are the engineering numbers first assigned by engineers and designers. The part numbers come about when the parts division sources the parts from different suppliers and other manufacturers.

2} They may seem identical, but there is probably some slight, and maybe insignificant change to the part. Ford loves to save money, so they probably didn't change the part number without a reason.


'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC

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Posts: 8
From: Pasadena, MD
Registered: Dec 2001

posted 12-23-2001 11:48 PM     Click Here to See the Profile for PetesPonies   Click Here to Email PetesPonies     Edit/Delete Message   Reply w/Quote
Yes, there are part numbers and there are casting numbers ( when dealing with cast parts). The part number is in the books, not neccessarily on the part itself. Car manufacturers change small things all the time. Many times a revision is made and the part never makes it to production. That is why Ford put at the end of the numbers-A, or -B or AA etc. These represent revisions. Many times a part was initially designed for one car, but will be used in many others. The part number digit for Mustangs is a Z, however you will find many other parts on you Mustang.

Pete's Ponies
Mustang RUSToration & Performance

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Posts: 213
From: Ocala, FL
Registered: Mar 2001

posted 12-24-2001 12:13 PM     Click Here to See the Profile for RICKS   Click Here to Email RICKS     Edit/Delete Message   Reply w/Quote
I did a very long, fairly comprehensive post on part #'s vs. engineering #'s months ago I thought, but I can't seem to dredge it up, so here we go..... Fastback68, any postwar Ford car you work on is a conglomeration of parts that were either:

1. Designed specifically for that particular year and model,

2. Designed for that model, but were carried-over 100% unchanged from the previous year,

3. Designed years ago for an entirely different platform, but used none-the-less on your Mustang because of it's easily universal application. Think about it, there was nothing "Mustang-unique" about many of the mechanicals on the car, like axle seals or lug nuts or C-4 transmissions for example (stuff commonly used across the entire Ford car line), so Ford surely wasn't going to bother re-numbering all of those general commodity parts just to make them "Mustang" parts.

An engineering # is assigned to a part the MOMENT that part is developed. The number will reflect the year and car platform that the particular piece is currently being designed for, but that same part may get picked up and used on MANY other Ford/Lincoln/Mercury platforms far into the future in order to save money time and resources. i.e., it would have been absolutely silly for a Ford engineer to develop brand new unique C8Z door hinge pins for the Mustang, when there were perfectly applicable and useable B9A door hinge pins developed in 1959 for the full-sized platform. So all Mustangs use B9A-5943030-AA door hinge pins that date back to "B" (the fifties) "9" (1959) and "A" (full-sized Ford passenger car platform). Many parts for the Mustang were "snatched" from the Ford parts bin. Thunderbird #'s ("S" body code), a BUNCH of Falcon #'s ("D" body code), and a bunch of 50's era passenger car ("A"). When it comes to wheel studs, and axles, and electrical items, the origin of the parts pre-date the origin of the Mustang by years and years. All Mustangs (and every other Ford car) were using 1949 Ford wheel studs in the 60's for instance. Only those items that were either developed and produced from scratch for the Mustang, or even needed just the slightest design change for the previous year Mustang received a new Mustang-specific #. Ford did not go to the gargantuan trouble of re-numbering every single part # every year for parts that were simply exact carry-overs from previous years, or came from a different platform.

The actual "Ford Part #" is assigned to represent the part in its final packaging, ready to sell. This is different than an engineering #. The engineering # identifies the part itself, before it has been installed on a car on the assembly line or stuck with a sticker or put in a box to be sold as a replacement part. The engineering # can be a "casting #" when it is actually molded into the tooling, or it can simply be a sticker when it is something that does not lend itself to having a permanent # stamped onto it (exterior windshield moldings for instance). The moment the part is put in a box or package, or simply LABELED for final identification, it recieves a unique "Ford part #" that tracks it in that state. A Ford part # can represent either a single part, or an entire assembly of numerous parts, like a transmission. The casting # on a tranny is ACTUALLY nothing more than the engineering # for the case itself.

That's the basics, and I could go on but I've run out of time, gotta meet someone. The suffix "-A" or "-B" or "-DD" represents a different iteration of a basic part. 1965 Mustang grille for car without foglamps is C5ZZ-8200-C, 65 grille for car WITH foglamps is C5ZZ-8200-D. Hope this all helps!!

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Posts: 1234
From: PHILA. PA.
Registered: Feb 2001

posted 12-24-2001 12:22 PM     Click Here to See the Profile for 7DMACH1   Click Here to Email 7DMACH1     Edit/Delete Message   Reply w/Quote
Now you know way I'm CRAZY!!! 32 years of this stuff!!! Merry Christmas RAY

86 MERCURY CAPRI 5.0 RUNS 12.86 @107 1.65 60 ft.

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Posts: 1315
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 12-31-2001 06:38 AM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
Thanks all, especially Ricks. Can I now be a PITA and ask a really specific question? Maybe what I'm stumbling on is "assembly" parts numbers.
The reflector housings (I think they're called) in my '68 are rotted out. I have a couple of slightly better ones in my late '68 parts car, and a couple of beauties from my '67 parts car. This is why I'd like to know just what I've got.
According to Osborn, these housings came in '68 with the lenses as the "C8ZB-13404-A REAR LAMP ASSEMBLY".
In total, I have six reflector housings and six lenses, and all 12 pieces are stamped SAE-TSDB-67MG. If the parts look identical, how can I tell if I am dealing with '67 or '68 parts? Is it possible the parts used in '68 were the same as those used in '67, but were maybe assembled with different gaskets or something, warranting the use of a C8ZB assembly number?
If anyone has a '68 that they are sure is an original in this area, and if they could be kind enough to go look on the back of the reflector housing and see if they have SAE-TSDB-67MG stamped there, I'd sure appreciate it.
Happy New Year!

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