Hey guys... It just finally got cold here in Texas today, and whether or not the temp is a factor I felt a slight thump/hard slam each time I came to a stop light.. I never felt it before, or it was there and I just never payed attention to it. It happens a split second before coming to a stop... Any of you have this happening in your 300C's? Will the Lucas Stop Slip help? Other than being abe to feel the downshift in the pedal, the tranny shifts perfectly and right on time with no other issues. Only other thing is am half way through a tank of Seafoam now... Engine had a slight stumble at idle, and it appears to have fixed it completely!