I just bought a 2005 4.0 v6 mustang. It was making a racket. I knew it was the timing chain. When I took off the value covers. I noticed that on the driver The driver side that the timing chain guide was missing the bolt to hold down the guide on the top. And broken. I removed the value cover on the passenger side and saw the timing chain and gear on the back of the moter. Grrrr I wasn't happy about that at all. So I started looking for info on this moter. I couldn't find much. Like how to retime this moter,and do I have to pull the moter to change the back timing chain and guide? I would like a diagram so I know more on what I am doing, but the only book I found. They was tring to charge me $200.00.