Hey guys, strange issue here. About 2 months ago, I had my transmission rebuilt, ever since my truck has been making this odd noise. It started out only happening when the engine was cold and when I accelerated hard, but now it happens when I barely press the gas accelerating from a dead stop, or when I press on it hard while on the highway attempting to accelerate at high speeds. The sound is comparable to taking a large jug, placing a marble inside and shaking violently. From what I can tell, the sound sounds like it is coming from the drivers side rear (closest to me). If I'm accelerating, and I take my foot off the pedal and press it again, generally it will stop. It also doesn't make this noise when idling or when pressing the pedal in neutral or while in park (at least not that I can tell). Anyone have any clue what this sound could be?