Does any one know if the torque converters in broncs were lockup. If they were, can the lockup portion of it go bad or wear out. I am asking for my 86 351w with 3 speed at w/o overdrive. It just feels like it is always slipping. I need to get a little more out of $50 worth of gas because I get 8 mpg and I want at least 10. Can a new torque converter do it?