Lifted Jeep makes terrible rattle/grind

I

inm101

New member
After lifting my 2 DR 09 Jeep Rubicon (manual transmission, 4.10 gearing, 35" tires) with a DV8 Rock Runner 3.5" (purportedly stock driveline compatible) a grind/rattle upon acceleration in any gear became apparent. The noise occurs for about 5-10 minutes until the Jeep is warmed up and then completely disipates.


It seems as though it is coming from the rear driveshaft area (all DSs are stock) though I am not sure how to fully confirm. I made this video in an attempt to capture the issue:
https://youtu.be/LWbLQz2UnOM

I did find a very small amount of grease leaked from the front DS transfer case boot. Furthermore, I made these videos demonstrating the driveshaft's condition:

Rear - https://youtu.be/YJciC4iIoWY
Front - https://youtu.be/DDsZpijQjAc

My question - I understand both driveshafts ultimately need replaced. I'd like to start with the one making the noise. My hope is that installing a double cardan driveshaft will resolve the immediate issue. I need help determining exactly which one needs replaced and if my expectations are within reason.
 
I have to say that it's really odd that it goes away. If the noise persisted, it'd be a lot easier to track down. I was listening to this on my phone so I couldn't get a good feel for what I was hearing but are we sure it's not an exhaust issue?
 
Closing the loop.

Here's what didn't fix it...new pinion bearing, new adjustable rear control arms, new diff, transfer case, transmission fluids.

Here's what did. New front and rear Adams drive shafts.

Cheers!
 
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