Photo indicates shear of rear drive train, no damage or deformation of front drive train assembly indicated in photo. Photo suggests that front drive train is in normal motion, rear drive train shear indicates catastrophic failure. I would suggest that rear drive train torque transmitted exceeded factory recommendations. Possible indications of this failure are as follows: you left your brakes on during a self service car wash, you argued with a cop and pulled the backside off a tow truck off, you were a "watch what this does" when frat boys hook a chain up to your rear axle or winched out with via the tire wrap method, my theory... is you were going forward, truck bounced up... somebody rear ended you or forced objects into you, stopped rotation of rear drive train and sheared the thingie you have in photo. I have no idea what I see in this picture but I have seen it when I extract lego blocks, stuffed animals, and pool toys out of my lawn mower.
Ashton