XJ making strange noise-need help plz

Hello all
So I have a 92 XJ 4.0, got her all lifted up, replaced many parts, new hubs, brakes, steering components, diffs the whole nine. Now, only while driving does it do this, but it makes a weird sound, kinda like a turbine, or a whining. Only when accelerating or decelerating, never in neutral, park, or at idle. And it only does it sometimes...but more often than not. I have no idea where to look. Did a trans filter and fluid exchange, no change. The entire vehicle minus the diffs, steering, and engine has 235k on it.
Has anyone had this issue? Or can shed some light on the issue? Much appreciated all!:us:

How much did you lift it? Rear drive shaft may have too much angle.

Or you have a set of gears in either diff set up wrong.

5" front 4.5" rear
xcase dropped 1"
3:55 gears front and rear