My Crossfire started making a popping noise in the rear end late last week. It first happened when I was shifting the car in manual mode under moderate acceleration, I would give it gas and it would pop, I would let off the gas and it would pop again. It has gotten progressively worse... it happens when I go around corners or over bumps, or am just slowly idling through a parking lot. My mind instantly goes to a popping u-joint. But at only 47k miles, I find that hard to believe. Anyone else have a similar problem, or ideas of what it could be? Since my car is way out of warranty, where should I take it to get looked at, and not get completely shafted?