Whelp im going to bump this thread.
My rig is coming up on 100k here in the next few months. I have done the TC fluid change ealier this year, and diffs at about 89k. Plugs were at 80ish I think.

So that leaves the PCV valve? Whats this thing look like? where is it at on the 4.7? Can I change it myself?

Also, is there any gain from changing the oil from conventional to synthetic at 100k? I am lame and have the shop change my oil with the normal stuff, and have done so for the last 4 years. Should I switch to Synthetic?