in operation in order to solve the above identified potential drawbacks the applicants discovered that such rotational backlash can be decreased as the contact angle between the ball and the ball groove for the inner and outer joint members increases and as the skew angle of the ball grooves increases the applicants further discovered that the rotational backlash can also be decreased as the pitch circle diameter pcd increases based on these findings the applicants further discovered several effective ways as described below in details with reference to fig6 11 to reduce the rotational backlash in the ball grooves while also maintaining a similar or equivalent strength and durability of the joint as that of the previously described embodiment of fig5 with reference to fig6 8 one preferred embodiment of the present invention is described below in details except that described below the basic structure of this joint is similar to that described shown in association with fig5 above and detailed descriptions regarding to the common elements and structure of this embodiment are to be omitted herein for simplicity purposes and to be referred above as is similar to the previous embodiment of fig5 and unlike the conventional cross groove joint as shown in fig4 which has the grooves alternately disposed in opposite directions with the same.