TorqueFlite Burnouts

d55dave said

Yes. It was scrapped, the trans was used for parts to build a big block 65 vintage trans.

I removed the outer race and it appeared undamaged. I don't know if the crack was there from the time the race was originally pressed in or as a result of whatever caused the sprag to roll over. Everything else in the trans appeared normal.

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To me those photos and your explanation of the two distinct types of roller clutch failures are one of the best explanations I have seen.
It also explains that even a 904 while not as explosion prone, can still fail the roller clutch and you have a broken transmission.
Low band apply valve bodies and upgraded roller clutches are imho wise purchases for a performance torqueflite of either version. An aftermarket drum with a higher explosion rating is also wise just in case all else fails.
I also re read the exploding torqueflite post and noted that the drum rpm on a failed sprag is engine rpm multiplied by the first gear ratio.
So if your torqueflite has a 2.74 low gear, it is much easier to get the drum to its rpm limit. Most articles I have read claim it is engine rpm multiplied by 2.2