Hey Starnut,
It could be your upper control arm now clunking. If you took the slack out of the drive shaft, it may now be putting that force into rotating the diff which is applying force to the upper control arm.
Just a thought, they aren't a long lasting item (1-2 years), especially with a lift.
There's plenty of threads on the upper arm, have a look. Can replace the bushes, but there's a risk of crushing the arm
Can be just worth replacing the whole unit.
Good luck
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