741 Case yes!
What center sure grip? Dana 4 spider is easy to tell with + cross shafts and 4 small spiders. The cone style center has springs with thrust plates. The 741/742 cases were designed to use the Dana. 489 cases will accept both usually with no issues. My 742 with 4.56 was no issue with the cone style, but dropping to 3.55 caused an issue. So post back what you think you have or take some better pics from angles to help the forum help you!
