I have bent something in the front diff, the rear diff is missing a bunch of teeth in the big rock i just picked up. I definitely beat the hell out of it though. It had the exb diffs of course. To get it back up I have 2 exbs coming from arrma but I am definitely upgrading, I think the composite bulkheads bend/flex a bit during abuse. Hoping vivaton is worth the money. Couldn't believe how much they wanted for a loaded diff and the bulkhead. Gahly but what do ya do, play, break, fix, repeat...