Extraordinary claims require extraordinary evidence. So far,
@Tophansen has presented zero credible evidence to support his claim...and there are literally thousands of examples to contradict it.
The notion that a "State Patrol" inspected the frame and warranty tag, and a picture cannot be produced because "the engine is out..." is disingenuous at best. These are the kind of "tales" that get invented by charlatans and confirmed by spectators. For many years, these kind of things were accepted as "factory deviations." But we are no longer living in the 1970's. We have technology, and we have information sharing, and we have pooled knowledge.
So I'm just going state the original assertion, and the alternate hypothesis and let's see which is more likely.
H(o) My 1967 Bronco was manufactured with a "leftover frame" built to 1966 specification.
H(a) My 1967 Bronco body tub with warranty plate ID# U15NLA48197 was built in November of 66, and is sitting on a 1966 chassis from another Bronco.
1. You claim that you have a "single master cylinder," which means that you have a hydraulic brake light switch, and no brake balance valve. Which means you have brake light WIRING under the hood. Which means you have a 1966 wiring harness. But a 1967 has a brake light switch on the pedal inside the Bronco. Which means that someone had to EITHER install a 1966 wiring harness which just happened to be "leftover" on the assembly line...or someone had to modify a 67 harness on the assembly line. This would have to be performed by a high-school educated UAW line worker with no tools, and no parts, and would have had to be performed in under 90 seconds. (typical TAKT time of Bronco assembly in 1967)
2. Somebody had to make this "leftover" frame and somehow introduce it to the manufacturing flow. Please understand that the frame would be assembled and welded and then stored "somewhere." I don't know where "somewhere" is located, because the frames are built to spec...and there would have to be frames for 6 cyl Broncos, and 8 cyl Broncos...so somebody would have had to KNOW that they were going to need a frame for a Bronco that was going to be built 4 months later...and AFTER the factory had been re-tooled. Keep in mind that Ford is building 100,000 vehicles per month, and they ONLY close down for 2 weeks to re-tool in Late July/Aug. They wouldn't even have the tooling in the factory to make the stamped part that you call the upper shock mount.
3. Somebody has to install the rear axle into the chassis. Again, you have 90 seconds. And you have to have an axle from the drivetrain group that has the correct gear ratio, and correct capacity, and correct limited slip and brakes. OH...it also has to have the shock mounts welded on it in facing FORWARD. So you need an axle that was built using tools and fixtures that have not been in the factory for over 4 months.
4. Somebody needs to install the rear shocks. But what shocks to install? And where do they come from? What part number? And what wrench is used to attach it? The line worker doesn't have the wrench needed to attach the shock! And he doesn't have the shocks. And he wouldn't install them as a "one-off" even if he did have them. He would pull the Andon and stop production. This unit would be removed from the line, and production would resume. There would be lots of meetings, and analysis, and countermeasures put in place to prevent this lunacy from happening again. The UAW would no doubt file a grievance for creating a hostile work environment and impossible working conditions.
5. I could go on...but I won't.
Now will you please post a picture of your frame VIN as has been requested by
@Scoop @toddz69 @DirtDonk @okie4570 ? Everyone is trying to help you with a wild notion that you might have a unicorn. But you have no evidence of a unicorn...yet.
And yeah...I guess that makes me a VIN expert.