the life of the truck depends on how it was previously used. If it was maintained properly and driven respectbly, then I figure you should get another 80.000. I have seen them with over 200k. If it belonged to a high school kid who watched The Fast and the Furious to many times, then you may not have long. Check the maintenance and who owned it. If it has a lube center sticker in the window, take the lisc. no. to them and see what maintenance was done. I have had a couple of the 4.3's, and loved them. It is pretty peppy for a 6.Good Luck