I found a 2005 quad Srt10 with 86k and a engine knock. The lady is wanting 7k for the truck. If I need to replace the main bearing. What kind of cost and where to look for advice on the rebuild if I just do the bottom end. Should I walk away. I can get a base model 04 with about 96k for 15k that is running good. I like working on vehicles and thought 7 k for a quad cab truck was a good price but every where I have looked the engine to replace is more than what I would have paid for the truck. I need help making the decision on which truck and what to do after that.