Dick, not sure what I was thinking yesterday. On the Pontiac Plant Manifest records, a GTO with 3.90 gears DOES show Sales Code 644 for the HD Fan.
Since yours came that way and no shroud, looks like I misguessed about the availability of the HD Fan as a separate option for the GTO.
Can you confirm that the Fan you describe is 19.5" dia.?
Assuming it is, your 4 bbl car and the Factory Axle Usage chart in the Inspector's Guide (a lot more detail than the Axle Chart in the GTO Sales Brochure) all point to the fact that the 3.90 was available with either engine and all 3 trannies with the GTO, and the mandatory HD Rad & HD Fan additional option requirements were same for the 4 bbl GTO, as for the T-P GTO, when 3.90 was special ordered. I don't have a copy of a 4 bbl GTO Manifest with 3.90 axle, but the Pontiac Plant T-P Manifests that I do have that show 3.90 axle all show Sales Code 644 for the HD Fan and Sales Code 432 for the HD Rad on the Manifest.
I only have one Pontiac Plant Manifest for a GTO with A/C. It does NOT show Sales Code 644 or Sales code 432 (which it certainly was built with), so I now conclude that the HD Rad & HD Fan (with shroud & seals) were included in the A/C option and would not have been separately listed on the Window Sticker for an A/C GTO. But for a GTO with 3.90 axle, the HD Fan & HD Rad do show up on the Window Sticker, at least on the Fremont example I have.
Yesterday, I speculated that you might not be able to order Sales Code 644 to get the 19.5" dia. Fan on any GTO as a separate Option.
I now conclude that the HD Fan was an available Special Equipment Option in '64 for the GTO even though in '65 (Sales Code was changed to 534 on the '65 ASSE Order Form) the HD Fan shows N.A. with GTO.
Dick, your Dealer Order Paperwork didn't identify the HD Fan. But I wonder if you have the original Window Sticker (I don't trust the repros, they are not very accurate) still and does it show a line item for HD Fan & HD Rad?
The Pontiac Plant Window Stickers were set up differently than the Fremont Plant Stickers. So no telling if the HD Fan & HD Rad were broken out as line items when 3.90 axle was ordered, but if you have the Sticker, it would be interesting to know if they were. Even the descriptions could be different. At Fremont, there was a typo, it reads "K08 FAN HEAVEY DUTY 644". Aside from the misspelling of heavy, note the use of the UPC K08. The Pontiac Plant did not use UPCs, Fremont was a B-O-P Plant and UPCs were used at the B-O-P Plants.
But the K08 designation is a bit interesting too. In the Inspector's Guide, the Sales Code 644 HD Fan shows the UPC as K01 with a note indicating "326 Engine". The HD Fan for the 326 Engine was a different Fan than what the GTO used as I mentioned yesterday. In fact it was a 5 blade Fan. I don't know anything else about it except the p/n and it used a Spacer and was not a clutched Fan. With A/C, the 326 cars got the same 19.5" dia., clutched Fan as the GTOs got.
So it seems, although the Sales Code was 644 in either case, I would guess the UPC for the HD Fan for the 326 was K01 and for the GTO it was K08.
And now I see I jumped to the wrong conclusion about the Tri-Power Radiator usage also!
I thought I had checked a sufficient no. of records. I mentioned one exception. But going back thru, I see that most of the non-A/C T-P GTOs seem to NOT have the HD Radiator. In fact, the only Pontiac Plant ones that I now can find with HD Rad also show 3.90 metallic brake axle plus one that shows a Special Order 3.55 axle with Safe-T-Track but std brakes.
Can't find evidence that the HD Rad was required for 3.55 axle in the GTO and I have another earlier Pontiac built T-P GTO, also with the same 3.55 Safe-T-Track axle that does not show the HD Rad. So perhaps HD Rad was just special ordered as an independent option on the later one. It is also possible that a running change made the HD Rad mandatory with 3.55 gears later in the year for the GTO. It is noteworthy here to mention that the HD Rad for the 326 engines (Code 54) was 15.5" x 2.63" and was also specified with special order 3.55 and 3.90 axles with 326 engines as indicated in the Dec. '63 Inspector's Guide.
New conclusion, T-P '64 GTOs did NOT get the 17.5" x 2.63" HD Rad as standard content or the HD Fan. If you ordered 3.90 gears, HD Rad & HD Fan were mandatory.
The HD Rad or the HD Fan or both could be special ordered on any GTO as individual options and were listed on the '64 All Series Special Equipment Order Form.
A/C GTOs got the HD Rad & HD Fan, included in the cost of the A/C option.
New conclusions summary:
1. If you wanted the HD Rad with any GTO, you had to special order it. Same for the HD Fan. If you ordered 3.90 gears, HD Rad & HD Fan were mandatory additional options but you did not get the shroud & seals.
2. If you ordered A/C, you got the HD Rad & HD Fan plus the shroud & seals.
And to emphasize, contrary to what I implied in my first post, the Code 58 17.5" x 2.63" Rad is not described as for use with the T-P GTO in the Inspector's Guide. It is now apparent this Rad was only used for V8 with A/C and GTO with special ordered HD Rad.
Going back thru the earlier posts, I realize that my conclusions may contradict what others are claiming.
Pontirag was pretty emphatic that the T-P '64 GTOs got a "taller 4 core radiator with a steel shroud". There is no evidence that there was a taller Rad released specific for the T-P GTO. And lots of evidence that the shroud only came with A/C, no matter what. So can't explain his claim.
OMT, who still owns his '64 GTO, makes a more credible claim. However, when suggesting taller, I suspect he is comparing to the non-GTO 15.5" tall Rads. But ALL GTOs, not just the T-P GTOs got the 17.5" tall Rads. I also believe he Special Ordered the 3.90 axle however. So he should have gotten the HD Rad & HD Fan as a consequence. What is odd is that he says "it was eliminated from the cost as the tri-power cars came with the heavy duty radiator". Perhaps what really happened is that the cost of the 3.90 axle included the cost of the HD Rad and so the separate cost for the HD Rad was eliminated. There is still the question of whether the HD Rad (& HD Fan) appeared as a line item on the Window Sticker. I believe his was also a Fremont build, and the Fremont example that I have does show the separate line ltems for them, so I assume OMTs Window Sticker showed the same. OMT, if you see this, do you still have your original Window Sticker to check?
He also says no shroud in '64, I assume he means without A/C as the A/C cars definitely got shrouds, both the factory installs and as part of the Dealer Accessory Package with the smaller shroud (reportedly fiberglass) to work with the 18" dia. clutched Fan. The smaller shroud was also used for factory installs on certain applications (taxi, police, trailering options).
Tripwr1964 seems to confirm my latest thinking except that there is no way to prove the HD Rad was not mandatory when T-P was ordered even if it is listed separately as a Window Sticker line item. Nevertheless, I now see lots of T-P '64 GTOs that do not show Sales Code 432 for HD Rad, those that do mostly show the 3.90 axle. And same on KC built GTOs with T-P that list the actual Rad manifest code, generally not the HD Rad shown.
And then 3 Deuce 64, has HD Rad with a 3.23 axle and T-P. Doesn't say if he is original owner, where or when built, and what is indicated on the Manifest or Shipping Order doc about the Rad. Also, doesn't indicate the trans, which I have more or less ignored but perhaps the auto trans T-P was treated differently from the man trans T-P. Has the regular GTO 18" Clutched Fan apparently. Was the HD Rad special ordered as a buyer specified added option or was it included because it got T-P? The former would fit my current thinking, the latter would upset the apple cart (could indicate a running change).
Pontirag's reference the GTO Resto Guide is not convincing. That reference is still pretty decent, but it was always mainly a compilation of what was found in Master Parts Catalogs and often got it wrong because of a lack of attention to superseding p/ns and misinterpretations of other MPC listings. And the hobby has learned a whole lot of new stuff since it was published many years ago.
However, just to remind you guys that I am never so sure of myself as to think everybody else must be wrong and I am right, I said this in the 1st para. of my first post in this thread, "and I don't know if anybody will be able to say what was done with certainty throughout the year". Including, and especially, me! In a single thread, I've been able to prove my fallibility.
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