But if you change components of it (the pumpkin) you may have issues. 742 cases used a Dana 4 spider center. The 489 used the Cone type center. The over all diameter of each is different. Never had an issue with 4.56 and the small pinion but when changing to 3.55 I got pinion rub on the cone center when trying to achieve gear pattern in the 742 case.
