I just purchased a 1994 suburban with 211000 miles on it. Every thing on the truck seems to work just fine. It is time for the oil to be changed and i am not sure when the previous owner had the transmission fluid changed. My question is, should i go ahead and change the filter and fluid in the transmission? The reason that i am asking this is because somebody once told me that when your vehicle gets this kind of high mileage, dont change the transmission filter and fluid. If i do need to go ahead change all of this, is there a special type of fluid for high mileage transmissions?