Sorry folks, but the final number stays private.
I will tell this though. The auction was actually a muscle car auction. Surprisingly enough, another Bronco was there. It was a '70 U14 from Kentucky. It brought $14k on the block and didn't sell. The '74's original sale price was more than the U14 brought. That's all I'm gonna say. ;D
Interesting fact: The Broncos brought more than a lot of the other vehicles there!