Yeah I spoke to True Street and I was told the same BS BUT when he told me about the gains I was shocked intake and custom dyno tune I was like HELL YEAH sign me up lol

 

i have a brand new f350 rcsb work truck with a 6.2 and we have a 2009 3500 with a 6.0 rcsb we lined them up and the ford would take the 6.0 chevy at any race. another thing to try if yours has the - + button on shifter when you put in D press the - down and see if it counts down the gears in dash and go to first. my work truck will and it will smoke the tires .

 

You need to drive more miles. My friend have the same problem but at another car which he buy with motortrader. Only when he drives a lot of miles he can put this poblem in bag) Also you can try accelerating in tow mode may be it helps.