What would actually break and more importantly how?

I've been told by a mechanic today that this is something he has seen before but I cannot figure out what would actually cause the transmission to break. I found a small tidbit on Mister Transmission stating abrupt stops could damage drivetrain components like transmission mounts, but there isn't any explanation offered as to how that damage could occur so I'm still not sure why the transmission mounts would be damaged.

Would using much grippier tires than stock affect this?

  • High shock loadings break things. – Solar Mike Sep 13 '20 at 5:49
  • "Can hard braking destroy a well maintained automatic transmission?" No, this is nonsense. – Moab Sep 14 '20 at 1:12
  • Front wheel drive car? Certainly really hard frequent breaking will induce additional loads on transverse engine mounts. But with that said I’d certainly expect a robust testing procedure to protect the customer for that. But who’s to say why any part wears out? Parts are warrantied for given mileage/ age. Beyond that stuff happens. Its all in the statistics and variability. Stuff wears out. Things break. It happens. Thats why this question forum exists. Make/ model / mileage? – zipzit Sep 14 '20 at 7:09

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