Join Date: Sep 2004
Location: Fairfield, CT and Oxford, OH
Check the fluid in the tranny, it will be the easiest and probably one of the only things you can do without bringing it down to the local shop.
Among many things, it's possible the noise is caused by resonance regulator valve system in the 42re, and will probably be most noticable at cold temperatures.
Old: '96 ZJ 4.0, 32" MT/R's, 4.5" Lift, Mickey Thompsons, JKS Disco's
New: '02 WJ Limited 4.7L, Stock for now