RE: 2004 dodge durango 4.7 Ticking Noise when started up
At 100k, your cooling system should be flushed and refilled w/ new anti-freeze. Also, if the tranny, T case, and front rear diffs have not been serviced, this is the time to do it.
FYI, the factory sparks plugs are only rated for 30k, so I would pull a plug or two and give em a look. If they are worn much beyond spec, replace em.