GM's Tiny $12 Engineering MISTAKE That Created A MONSTER

How could a tiny $12 part turn a standard transmission into an unkillable monster?

The GM Turbo-Hydramatic 400 (TH400) wasn't supposed to be a legend. It started as a mistake of over-engineering. In 1964, General Motors built a heavy-duty transmission that was accidentally invincible—and it all comes down to a few cheap components that were built far better than they needed to be.

In this video, we uncover the "Engineering Mistake" that GM never fixed: the overbuilt internals, the legendary Sprag, and the $12 vacuum modulator that allows this transmission to handle drag racing torque numbers 60 years later. They tried to build a tool, but they accidentally built a legend.

Chapters:
0:00 - The $12 Mistake
2:12 - Why GM Built Overkill
4:25 - The "Sprag" Explained
6:48 - The Switch-Pitch Secret
8:15 - Why It Can't Be Killed
9:30 - The TH400 Legacy

#machine #engine