So my cobra just started doing this 2 days ago. I will be in neutral while the car is on, usually after taking it out of gear like at a stop light or something, and I will feel the gears in the tranny start to engage. Sometimes it's just a marbles let loose in the case or other times it's actually accompanied by the car trying to lurch a bit. All I know is it doesn't sound good, feel good, and is not normal. Anyone ever have or hear of a similar problem?? It seems to get progressively worse. I really hope someone has info on this. Am I looking at a full tranny rebuild? I'd appreciate any input on the subject, thanks!