I have fought for nearly a year to figure out what was causing my popping noise on my 94 yj.  Anytime I experinced and slight twisting motion on my suspension it would have a solid feeling and sounding popping noise....At first I thought it was coming from the front but after walking outside while my wife drove it slowly I could hear it was coming from the rear.  To make a long story short it turned out to be my rear spring U-bolt plates.  They were bowed and the u-bolt holes were worn enlongated.  Once I replaced them,the noice was gone and has not come back.  This has been a very frustrating experince and I wanted to share it with my fellow jeepers so they may fix it easily.  

cool, thanks for the info. at least it wasn't something any more serious than that  

Thanks for the heads up.....I've got a rattle coming from under my dash and it's driving me nuts. If I ever find it I will post something about it.  

Rattles and noises are the worst...they are so hard to find.  

Now that I thought about it I had what i thought was a rattle under the dash.  It turned out to be the hood suport rod.  I put a rag under it and the rattle went away.  

On my 91 yj, my rattle turned out to be the hood hitting on the fenders.  I ended up upgrading to a lot polyurethane bushings trying to find it though.