[Scotty89]

Try the sway bar bushings. My votect instructor's van was makeing a poping sound when you would rock the van. The sway bar bushings was stuck to the bar. The sway bar should move a little in the bushings. All I done to fix this was I took the brackets lose to the bushings and twisted them to break them lose. Then squirted some lube in the bushings around the bar and reinstalled the brackets. Its been fine ever since.