I need some advice on this one.....95 mustang GT automatic (C4?) I am not sure. I have owned it for three weeks now and have had some issues. The car was shifting early when I bought it so I knew it needed a speed sensor on it. I changed it and flushed it and added an anti friction, filter, new oil, the whole shabang. Now I am getting shuttering and vibration right before the shift point. This happens at a low throttle, never when I have little foot in it. This has me boggled. Did the Anti friction cause this? or what? Seems to be getting a little better as the days go by but hell I may be looking at a rebuild if this stuff doesn't work. Any ideas..................................