So we had our last pull of the year and there was a huge showing of diesels as always and there was a 6.0 short bed extended cab F250 there that was rockin' it.....he'd come off the line and this thing had major tuning but would cut out until around half track and then it would roll coal and just play with the sled. Well second time he pulled I sure felt bad for him when he got to the end of the track it burped and it was at full power and when the smoke cleared he had ripped the pinion clear out of the rear.......ouchy