With less the 30K miles I've only had a leaking back window, a leaking transfer case, a radiator fan go bad (left me stranded in AR), issues with slow cam sensors (x2), and cam go flat, all as individual problems. Currently it's in ND where it left me standed (I live in KS). It's been there for...
I used extra plastic rivets and a little heat from a heat gun. I also cut the back ones a little shorter so that that matched the bottom ending point of the front.
If the rattle follows the RPMs it could be a bad cam. With your windows down, so you can hear better, park somewhere where you have a structure beside you (for the noise to reverberate). Have it in park start slowing raising the RPM's. If the noise starts coming up with the increase in RPM's and...
I would leave it as is. I've been running the 1.5" spacer and bump stop on the front of my JTR with no shock changes. I don't do hard crawling but some pretty good trails for overlanding. I've put it in some good off camber postions with one front tire off the ground without issues.
If the rattle follows the RPMs it could be a bad cam. With your windows down, so you can hear better, park somewhere where you have a structure beside you (for the noise to reverberate). Have it in park start slowing raising the RPM's. If the noise starts coming up with the increase in RPM's and...