Something doesn't seem right. The new Motor makes 70 more HP and I think it has to be less torque? Since it stalls less...Less Torque from what I understand. So I think the converter needs to be looser.
I would say about 5500 as a Minimum and I think closer to 6000 would be better. Don't want that motor to drop back too much with not as much Torque to pull it out. Just a thought. Maybe I am off my rocker?
ops:
Also what was the old MPH? What is the new?