I have a '95 YJ that I just installed a 2" suspension lift on.  The kit that I installed included a transfercase drop (1").  After I got the entire kit installed, I drove it and it makes this horrible chatter noise.  The noise sounds like metal banging back and forth.  It usually happens when I'm not accellerating real hard or if I'm just coasting with it in gear.  I just filled the back diff with gear lube and it didn't make any difference.  Anyone have any idea where to look next?  

check your U-joints.  You might have had one that was failing ... and now it's under more stress.

Pete  

I'm waiting for new u-joints now.  I got the Dana/Spicer 1330HD so they're greasable anyway.  Thanks for the help.