What they had was a mix up of the 60t mechanism and the matco/aero 88t mechanism. Poor assembly practice, but quality is great. Armstrong oems these for matco, which as we all know is the main competitor to snap on
There were several issues with the 84T ratchets.
Some of the craftsman ones were shipped with either a 60T, 84T, or 88T gear, and a 60T, 84T, or 88T pawl. Made for some interesting combos (none of which worked).
There were still some USA made Craftsman 84T ratchets that would lock up and self reverse even with the proper matching 84T gear/pawl. And this is where it gets interesting.
The Taiwan made gearwrench 84T ratchets had the same problem (locking up and self reversing) even with the proper matching gear/pawl.
2 ratchets produced in different factories both having the same problem? Screams design flaw/tolerance issues to me.
Now, with all that said, once you get a 84T ratchet that works out of the box (and the first few times you put it under load), they never seem to fail after that.
Also worth noting that neither the 60T or 120XP ratchets gearwrench sells suffer from this same problem.