Bambukiller

Hey I recently picked up a C320 4Matic Wagon with 150,000. I didn't by it to be a daily driver I have two other vehicles. There is a winding noise that sounds like it may be a trans issue. But it does slip or miss gears. It's really fast and gives me the speed I'm looking for. But in number to bumper traffic at speeds less then ten miles and hour it seems sluggish for lack of a better word it doesnt slip. But it seems like it just wants to go fast. I've let a couple of guys I usually trust with car advice drive it they say I got a steal on a good car. They aren't the o we out of the cash if it's the trans. And if it is a trans issue any idea of cost? Greatly appreciate any solid feedback you all have to offer. Travel Light...