stahl speed

Stahl speed? You of course mean S T A L L speed; the RPM at which
the torque converter would "stall" and cease to slip.

Stahl was a company started by Jere Stahl and made high $ headers
and special tall front drag tires.

This is a common misconception as I don't think you can pick up an
Auto-Trader without seeing an add for a car with a "stahl converter".