Well if you have not done so already you are really going to have to think about doing the timing guides on these vehicles. I did mine since the timing covers were leaking. Funny thing is the week before I was going to rip it down to fix all the leaks and timing guides, a small whirring sound developed almost like an alternator bearing. checked it out and the sound was not coming from the alternator, ac compressor, or pulleys. So when we ripped down the engine just started to see the beginning pieces of the timing guides come apart and the chain just started to make contact with the metal. Talk about perfect timing.