There is a lot of mis-information on the Internet about the 741 Case. I have not seen or heard of one ever breaking from an END User.........Guys start these rumors because the pinion shaft is a lil smaller than the 742 or 489 versions.
I had 1970 Swinger with a 741 case/sure grip and 3.55 gears in a 410 Stroker with a 4spd. I ran that car hard. If it was going to break it should have, believe me!:burnout: