Exact same issue with my 2018 JLU Sport. 12,000 miles/manual transmission. Very pronounced problem between the first three gears when coasting down the clunking in the rear starts. Can feel it through the pedals and steering wheel and hear it audibly. First two times I brought it into the...
2018 JLU Sport. Mopar 2" lift (more like 3"), 18" black rhino wheels with 35's. Steering got wiggly after the lift while on factory 31's. I installed the lower control arm drop brackets. Now with 35's it rides as nice as non - lifted stock.