I've got a automatic 2004 gt, the transmission shifts fine, not particularly smooth, but acceptable. After braking hard without stopping like entering a corner, the transmission let's go like it's in neutral and wont re-engage for a second or two, it will just rev up freely and then snap back into gear. It only does this when it's hot which leads me to believe it needs thicker fluid, I added about quart of Lucas stop slip and that seemed to help. Any ideas on what I should do? Do a full Lucas treatment? New fluid? Torque converter? Primary clutch? Solenoid? Any helps appreciated, thanks.