I have a 98 ML320 SUV. It runs great except when it takes off from a stopped position on an incline. Then it makes a loud noise, sort of a clacking,"chugging" noise like you hear when you are going up an incline in a roller coaster. It feels like it is jerking under the driver's side or a cable is slipping. It always happens on an incline. Today it happened when it was level for the first time. i have not had it for long. also, where the odometer is, when you turn on the car, there is a picture of a wrench an it says "-4000". the numbers have progressively gotten bigger. a mechanic said that was the oil indicator, but it has fresh oil. i was wondering if this is related to transmission fluid. Thanks ahead of time for your help! i lost my job and am desperate to fix it the cheapest way possible!