I don't see any issues with the 68rfe with proper tuning and someone driving it that isn't trying to destroy it. I had a 2011 with a 68rfe and it was perfectly fine, ended up getting bored and swapped it to a g56 and all I gained was listening to it growl and having to shift it myself. After I did that I missed the 68rfe for towing, I sold that truck and went and bought a 2015 with 26K miles on it with a 68rfe and I have no regrets. Worse case scenario I might have to rebuild it, but I highly doubt I will within the time I own the truck.