I know this is late but i work 50+ hours a week. Lol Anyway, Its the strangest sound ive ever heard a transmission make. Its sounds like a gear grinding against the case in first gear. I was on totally level ground. I checked the fluid the day before. And after it made the noise. It was fine, cold and hot. From what i can tell from the service records, everything has been kept up on, it only has 68k. Thats less than average yearly mileage and its a super clean car. It literally feels like the trans is slipping in and out of gear, but its auto. So i dont understand how, it drives perfectly fine when it feels like working right. When it acts up i have no reverse, drive feels like its stuck in gm limp now. Hit the gas and it doesnt want to go. Sometimes it will make a grinding nouse when its acting up. It has me stumped, and im no idiot when it comes to vehicles.