I am finally going to get rid of my 4.2 97 POS. Seems every gasket has something oozing from it. Now its losing coolant so I know it the head gasket because I see no leak. So I am looking at a 2000 5.4 SC4x4. It has 25000 miles and comes with that certified warranty up to 75,000 miles. Is their anything I should be looking for before I actually purchase this truck? I have spent so much time reading on the 4.2 tread that I neglect this tread. Any help or advice would be great!!!!