8 3/4 question

To give you an idea of how much BS and red herring nonsense there is about 8.75 carriers... Read this.

https://www.doctordiff.com/blog/tech-info/rearend-pinion-comparison/
All 8.75 use the same ring gear for the respective ratio. Caps and ring gear deflection are the big deals with these rears.
Only the pinion bearing stuff is different and it is NOT the issue in any of the cases.

489's many times fail because of the crush sleeve. Nothing to do with the bearing size. Any of them are usually good for our cars.
If you can break a 741, you are likely to break the others.