I have a 06 GT with about 20000 miles on it. About once every month or so when I try to gas it a little, it will rev but no power will go to rear wheels. Then after about a second it slams forward and takes off. I am worried about trashing the rear end if it keeps doing this. It seems to do it more often when it is wet outside. It has not done it from take off, just when car is moving. I have not had any faults show up. Any ideas would be helpful. I need to get it to the shop but without being able to recreate the problem, I don't know if they can do anything. Thanks.