Is a 7.25 rear strong enough?

DC Dart said

In an open diff 7.25 the spiders seem to be the weak link.
What is the weak link in the 7.25 sure grip units? Would it be the ring and pinion or axles?
If someone was teetering on the low HP scale they could possibly gain a little strength with the sure grip.
I have never killed or witnessed the failure of the 7.25 sure grip units as I do not think there were many made.
It is a bummer about the lack of 8 3/4 units around. I am glad I swapped mine out when they were still plentiful. One of my a body 8 3/4 rear ends came from a U pull it wrecking yard. The cost was like $50.00 plus $5. 00 core.
When swapping to another rear finding a donor with disks would be a bonus.

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It's still the spider gears. Once the clutches in the sure grip unit allow one wheel to spin, the spider gears start getting abuse. If the unit is good and strong though, I "guess" the axles become the weak link. They're mighty small. Maybe it's a toss up between them and the pinion shaft. It's just that everything about the 7 1/4 is small. It's just not a performance rear axle. It never was. People have had good luck with them in that application, though. Just look at @Charrlie_S. So evidently, they're a little stronger than people give them credit for. I've driven mine around since I got it in January of 2019 and the guy I got it from drove it from when new, until 1980. It sat where I found it since that time.