The Tremec isn't God's gift; it's got problems of its own. There's nothing wrong with this transmission, as designed. It has a good record in other applications and is up for the power level and weight of the Mustang application. Ford cheaped out on some outsourcing for components inside and now they and their customers are facing the back-blade of that decision. It sucks but, I will make this car work, one way or another.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85
2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP