Sorry Guys, Im a newbie here, and really know nothing about cars. A lot of my friends do but not european ones. They're tuner guys..newayz.. I have searched and searched for an answer.. but still a little confused.. As i've seen so far, my car (99 C280) has a 722.6 Tranny right(still confused whether or not it does)? Here's my situation..one day I was driving my car to the hospital to see a friend. I had to park very far because there was no parking in the front. I decided to move my car to the front parking lot..thats when the problem started. AS I was driving I noticed a weird sound, like a tool hitting the bottom of the car. When I stopped..it just died on me. Turned it back on and nothing happend. Then When I left again, I turned on my car and it made like a popping noise, as if it were gonna explode.. I drove around the parking lot and it would make some sort of clunking noise. I knew something was wrong with it because I sounded a lot diffrent than normal. It did drive well to my friends house. But when I left my friends house.. I put it on drive and nothing but revving. I tried again but this time in reverse.. same thing... I put it back on drive and when I pushed the gas harder.. about 3000-4000 RPMS, it seem to grab gear and stall like if it was standard. I havent tried to drive it on all gears and test it. Is there any test I can do to figure out before bringing it to a mechanic.. I called mercedes and they said it sounded like a valve body replacement.. but I would like to check the fluid.. but before I do that.. should I test it on ALL gears first before doing anything?? Let me know.. thanks