The present invention relates to a universal joint assembly, in particular, a ball yoke tube having a first receiving hole of a first inner diameter and a second receiving of a second inner diameter receiving adjacently coupled to an end of the first receiving hole of the ball yoke tube A retainer assembly having a hole formed therein, a ball yoke shaft accommodated and coupled to a second receiving hole of the retainer assembly, and a ring groove formed at an outer circumference of the end portion of the ball yoke tube, a part of which penetrates the ring groove to form the first By including a release preventing ring formed with a locking portion that extends overlapping with the end face of the retainer assembly accommodated in the receiving hole, it provides an advantage of improving the reliability of the product by preventing departure from the outside of the retainer assembly.
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