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i have had bad experience with those ones. I have never torn up the clutch type but have torn out 3 or the cone type.
1.was in a stock 318 barracuda. the pin in the middle came out and tore up the ring and pinion gears.
2.was in a 360 dart same thing happened
3. was in another 318 car.

they were all 4 speeds and so that was hard on them but only the 360 car had very much power, high 12's in quarter. i will never run another one of those units. trashed 3 sets of gears with them. i have never broken the clutch type and i have one behind my 440 dart.



The cone sure-grips only have 2 spider gears and they gall onto the center pin forcing it to break the locating pin and making the cross shaft spin in the case wallowing out the case holes. I'd say this is more of an issue than the "self destructing" complaint.



Chris the self destructing parts is what causes the the spiders to seize on the shaft , once the cones bottom out it turns into a one wheel wonder and the owner doesn't realize , it may still leave 2 black marks , but eventually the spiders seize on the shaft and the dowel breaks .

I opened up an open rear differential when doing a rebuild and it had one of the spiders galled up and was ready to seize on the shaft I had to use a hydraulic press to get it out.