Actually questioned Pro gear users on Drag Week, and were told they eat them up on a regular basis, like one set every 2500 miles!
Actually if all that was available was a pro gear, and you really wanted to run them on the street, you could send them out to get them surface hardened. You mask the root and harden the teeth.
Years ago I went the other way. Took a set of street gears and softened them. Never broke those and they ran a long time in my drag car. A pro gear was not available in those days in the gear I wanted. The street gears would crack in the roots.
