"In early 2013 when we began making 750-800 WHP with our 2011 Mustang GT, we had nothing but transmission problems. We broke 6 intermediate shafts and smoked 3 sets of clutches in a one month period. We sent our 6R80 to Circle D for the works. Since receiving it back in April 2013, the transmission has not been removed from the car. The pan hasn't even been off. It has performed flawlessly for the last two and a half years behind 1000+ WHP and TQ, enduring thousands of hard street miles, 40+ 1/4 mile passes and 4 passes over 200 mph at the Texas Mile. I exclusively recommend Circle D to my customers!”   - Greg  Turner (Sept. 2015)