I have a 97 F350 w/ 270,000 miles. I have never done anything to it except replace the water pump at 235K and normal fluid and filter changes. It is showing signs of wear. The pump and injectors need to be replaced and the tranny is starting to slip. I work for a ambulance company and they have a 99 and a 02 chassis that they are getting rid of. Both have over 300k on them but the pump and injectors have been replaced recently and the 02 has new heads on it. They are both E350 DRW cab chassis. I am still getting info on how many miles are on the trannys. I can get them for $500 each. Would one work better than the other or not at all? Are they worth messing with? I also have a 2000 7.3 excursion.