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I am restoring a San Jose built 1966 convertible Mustang. What is the correct color for the underbody ?
And while your at it what is the correct color of the driveshaft and the third member ?

Thank you in advance for your assistance.
 

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+ Basically, a red oxide epoxy-based primer sealer. So, the final look will be smooth and slightly glossy not like you have seen for rattle can red oxide primers. Tone and tint will differ depending on when the car was built and the tone/tint can often differ between the two applications. One from approx. the firewall rearward and the second one from that starting point forward.

That was followed by overspray from the exterior body color application to the body and in the rear wheel wells, Black from the engine compartment application and finally the pinch weld black out before the front fenders were installed all the way to where the rear valance would have been pulled into the unibody. It was hung from the taillight panel just before the car was painted but not pulled into the body until after the process

Invite you to take a look at all the pictures posted on the Concours site. Not an advertisement, just trying to help. Joining is not required to see the general question section organized by year. But you would need to join to see the articles such as 1966 San Jose Undercarriage Details or the unrestored car section

+ "Color" of the drive line would be plain bare steel. Nice smooth and fresh. With a heat line/stripe from one end to the other from forming the tube. Cast steel yokes at each end, so they will look different from the driveline and each would have had brightly machined surfaces in the appropriate locations and finally a dark welded where the yokes were attached to the tube. Of course, there will be bluing on the tube from heating the metal (just like on the edges of the heat stripe on the tube) near where the welds are. This can be done with gun bluing repair fluid as well as using it to create the heat stripe and darkened welds

+ Third member would be a different red oxide epoxy product - often slightly redder (floors are often a muddy red) and more consistent in color through the production year. This was applied to the whole third member inside and out then the casting was machined so you would see those details and highlights on it ans the pinion retainer. Some of these spots are different than on a 9"

Hope this helps
 

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Spammer Hammer
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My mostly unrestored San Jose ‘66 GT hardtop is black underneath. May be 55 years of oil and road grime though. I’ve tried to clean it up, but gave up after a while and just decided to drive it.
 

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If looking to reproduce the original look you will not find anything ready made out of a can. Will need to be custom made. To show the variation of just some of what was sprayed to the floor sections during 66 production at San Jose here are three examples. The first couple showing muddy brown examples (different cars) is closest IMHO to the most commonly found. Have a fair number of pictures of floor examples for that year and plant as well as a few sections that have been cut from unrestored cars from the floors










Now some overspray examples

In this one the pinch weld black out has been cleaned off. On this example the amount of body color overspray is massive compared to som others. Must have been a shorter or younger (willing to bend over a bit more) painter. Arrow shows the red oxide color of the floor under all that red paint




Pictures to show the pinch weld black out overspray applied after the body color



This one is another red exterior car. Even with the low contrast between the red oxide and the red you can still make it out just inside the black overspray




Don't use the pictures to figure out the original color as camera settings, lighting and monitor settings vary too much to get a real true example of what they look like in person

Hope this helps
 

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If looking to reproduce the original look you will not find anything ready made out of a can. Will need to be custom made. To show the variation of just some of what was sprayed to the floor sections during 66 production at San Jose here are three examples. The first couple showing muddy brown examples (different cars) is closest IMHO to the most commonly found. Have a fair number of pictures of floor examples for that year and plant as well as a few sections that have been cut from unrestored cars from the floors










Now some overspray examples

In this one the pinch weld black out has been cleaned off. On this example the amount of body color overspray is massive compared to som others. Must have been a shorter or younger (willing to bend over a bit more) painter. Arrow shows the red oxide color of the floor under all that red paint




Pictures to show the pinch weld black out overspray applied after the body color



This one is another red exterior car. Even with the low contrast between the red oxide and the red you can still make it out just inside the black overspray




Don't use the pictures to figure out the original color as camera settings, lighting and monitor settings vary too much to get a real true example of what they look like in person

Hope this helps
What an outstanding answer Jeff. I’m looking like this for a 67 San Jose car made in September of 66. Where can I find a copy of the MCA judging rules for my car? This info could be helpful to the OP for his questions also
 

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Some cars had "slop grey" colored underbody rather than the red oxide, particularly the San Jose cars from what I've read. There may not even be any of that red oxide under the car at all.
 

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myfirstcar66
"Some cars had "slop grey" colored underbody rather than the red oxide, particularly the San Jose cars from what I've read. There may not even be any of that red oxide under the car at all. "

Been focusing on these details for 40 plus years and I can offer that the batch or slop colors for San Jose didn't start until 69 production. There was a period during 65 production for about 3-4 months where a very dark gray - almost black was used for approx 3-4 months. Can look at my data to be closer but works for this discussion. There was a period in 66 (maybe a day or a little more) where there was an odd color applied but very very unusual. Of course we're discussing the floor from wirewall reward that was applied with the premounted spray heads not the hand applied firewall forward.

For the floors at other plants, firewall rearward, NJ used red oxide up to the point where they stopped making Mustangs in 71. At Dearborn you can find batch or red oxide depending on the year and production period from the start of Mustang production through the end of the classics

Don't believe everything you see posted or read in a magazine. Also always check when the post or article was posted/printed as the hobby evolves and we learn or relearn things all the time.
 

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Groundpounder17
"What an outstanding answer Jeff. I’m looking like this for a 67 San Jose car made in September of 66. Where can I find a copy of the MCA judging rules for my car? This info could be helpful to the OP for his questions also "


For these details I would suggest not using the MCA rules as a guideline. You can finish your floors unlike originally finished and not get deducted for in those events. They are more giving and generic, to keep owners happy and to reduce the amount of information contained on the judging sheets. Spent decades workign on and deveIoping allot of those sheets in one way or another. I would hope you would want after putting in all the time and effort into the restoration, what is original and correct not just what will get by. Refinish them as they were originally and you will do fine if you choose to have the car judged. Take and provide documentation if there is something unusual, different or if there has been a judging "discussion" or deduction in the past that you can show proof of.
 

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@J_Speegle I believe it was some of your previous posts on Concours I was referring to, "some cars" at "some point", I remembered. Thanks for spending all that time on the details and replying here. I do well to remember what day or night it is, or if it's day or night when I have to get up for work haha! Maybe I should change my quote to "learn something new every time you're awake" rather than "...every day."
@1966MustangRagTop it's awesome you're taking the pains to do this right. Be sure to make and post lots of pics!
 

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Thanks.
It was a ton of work honestly. Car had been in OR its while life and had many oil/trans leaks with road grime. I was planning to wheel it all off originally. After hitting it with a pressure washer, it looked like some might “chip” off with a putty knife. Tried that and then scrubbed with Prep-Sol and it really came out clean. So, I just spend a couple weeks under the lift. It is the only part of the car that wasn’t removed and restored. I love how it is still the original belly.
First and second pic below was before. Third was after pressure washing only.
Troy
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