Universal joints, more commonly known as U-joints, are used in automotive driveshafts and front steer axles where rotational power needs to be transmitted between two misaligned shafts. They are comprised of a central cross with four trunions on which four sealed caps with internal needle bearings ride. The caps are held in place and within the yokes by snap rings.
Looks really nice, very detailed! And nice modelling, I´m far away from that...
Nicely detailed model, and the animation solution really takes it to another level.