Clunking problems

I have a 89 Jeep cherokee with a 3" rough country lift. I have a slight clunking sound when trying to accelerate fast off of the line at a stop sign/stop light. When I put it in four wheel and give it gas it gets way wrose. Lamost sound to me like the ball joints are bad, and maybe that it is even so bad that the whole axle is moving back and forth, idk, anyone have any ideas??? It is fine though in 2wd under "normal" driving conditions...

check your upper and lower control arms and bushings

Check your motor mounts.

I had the same problem on my '90 xj. it ended up being a inner axle shaft problem (pass side) along with the coupling ring and shift motor for the diff were all worn out...