Enough has been said about the facts, now let's put them to work by developing a hypothesis that ties it all together. For the original version, see
post #189 from December 26, 2021. Five sales codes ending in "9", all of them undocumented, it's a bit too much to assign to pure coincidence. Consider also that for most of these codes it could be demonstrated that they refer to special-order items, whereas for some others this can be reasonably assumed to be the case. What we have at hand here is a form-meaning correspondence.
In a code like F39, the final "9" signals something special and unknown, while the rest of the code, "F3" in this case, refers to the regular item or meaning this unknown thing is tied up with. In 1977-and-up broadcast sheets we have only the code range to find out about this regular item or meaning, because the sales codes are listed in numerical order in unlabeled slots, each within its own section. The list of known codes on the back of the broadcast sheet must be checked in order to find out about the code range an undocumented code relates to. The preceding posts have shown how clumsy the whole process can become.
Compared to this, with the broadcast sheet format in use before 1977 finding out the meaning of an undocumented code was actually a piece of cake. Almost every slot within a section had a label attatched to it that could take any of these three forms (examples from the 1971 version):
- both digits of the code plus a description, like "38 Roof Light Reinf."
- the first digit of the code plus a description, like "4- Roof Wiring"
- the first digit of the code, like "4-"
The letter of the code plus a general classification was given by the section where the slot was located, in the above examples "F Heavy Duty Fleet", so as a minimum two out of the three positions that make up a sales code were already given. In fact, such two-digit combinations sometimes carried a meaning of their own, like in the Power Items section:
P2- Seats
P3- Windows
P4- Doors/Tailgate/Deck Lid
1969-1974 sales codes have been studied pretty well over the years, so for that period one wouldn't expect to stumble upon undocumented codes so easily. Wrong! Actually it is fairly easy. Together with the examples F79, F99, J59 and N79
cited in post #198 consider this 1971 broadcast sheet snippet for a
Colorado State Police car, that contains two further undocumented sales codes. All the others have been decoded successfully:
In line 6 slot C8- Seat Springs contains "9". The documented codes for this slot are:
C81 Front Heavy Duty Seat Springs
C83 Rear Heavy Duty Seat Springs
C85 Front & Rear Heavy Duty Seat Springs
Undocumented C89 here acquires the meaning "Special-Order Heavy Duty Seat Springs".
In line 7 slot F8- Deck Lid Knob/Pwr Release has "9". The documented codes at this point are:
F81 Deck Lid Release Remote
F82 Deck Lid Release Electric
Undocumented F89 now means "Special-Order Deck Lid Release". Maybe owner
@robio can try and find out if there is something unusual with his deck lid release.
That undocumented sales codes ending in "9" should not be read as the sales codes ending in digits other than "9", is proven by interior trim code 97B3 (see previous post). Here "9" clearly runs counter to the format of regular interior trim codes, always starting with a letter. The only function of "9" is to indicate exactly at which point regular build info is superceded by something unknown originating from a special order. The rest of the code, "7B3" in this case, continues to convey its regular meaning.
In all cases "9" is in fact a pointer signaling to the user of the broadcast sheet to go and look somewhere else, because the info he expects to find at this point is simply not there. In this sense undocumented sales codes are not sales codes at all: they don't identify, they signal that for identification the broadcast sheet is the wrong place to be looking. That's why it's only logical not to include them in the Sales Codes List. Instead of "undocumented sales codes" it would be better to speak of "pointer codes".
As to the wider correlation, typically these pointer codes are found with fleet cars, ordered by a buyer who had bargaining power. There are numerous stories about the willingness of Chrysler to accomodate individual wishes expressed by the larger law enforcement agencies. Given that this was Chrysler's policy, a means was created to be able to code the unknown, ie. special items that a buyer insisted on being installed. This means is the Rule of Nine. It says that you can create a pointer code out of practically any known code by "nining out" the digit at the position that should not be read in the regular way.