I have a 64-73-12 turbo that I've been having some issues with. One of which is it will bark really bad when the tc locks under hard throttle. What is the main cause of this? Low drive pressure? The tc locks on it's own at 2800 rpms if I don't lock it in 3rd with the lockup switch. It will also do this same thing if I lock the tc in 4th and roll into it from lower rpms, once it hits about 2200-2400 it will do the same thing... It will be at 45-48 pounds of boost when it does this too. I'm afraid it's going to break the shaft. Any ideas would be much appreciated!