Sounds the same as discussed in this thread -- castle nuts on ball joints not tighted to spec.
do you have an LSD, aka, "anti-slip" rear axle? if so check this thread and sound clip in most recent postsDoes it make that clicking noise when you let off the gas going like 10-20 MPH and its coasting? My sport makes a similar noise to that.
Hi DesertRubi,Did you ever figure out what this was? My 2017 JKUR, which I believe has the same transfer case as the JL Rubicon, is making a very similar sounding noise. It clicks once when I hit the gas, and once when I let off. Only in 4 low, not 4 high or 2wd. Which makes me think it's something I side the transfer case.
I also get a louder click/clunk when shifting from drive to neutral on the AT, again only when in 4 low.
Here's a video of mine showing both of those symptoms:
Hi, I am also experiencing this in 4LOW on a 2018 JLUR ever since I got the vehicle delivered brand new from the dealer. I have been told this is normal by the service mechanics. They also did checks on twice without any issues remarked. Other people with 2018 JLUR tell me that they don't experience the same noise. The noise becomes more prominent when I am going downhill.