No diff problems, but we did find the problem. After researching the history of the truck we found it had been in an accident. Soneone ran into a steel collumn with the left fork - broke the trunion. So after we pulled the trans, we pulled the mounting plate ( like a spacer between the trans & block). It was tweaked. When we bolted the trans up it would load it to one side - causing stress on the flexplate.