Probably should have worded it much better
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The only guy we had that broke constantly was a FJ80 on 40s and a 6.0 LS of some sort. All that he had done to the axles was lockers, gearing, and chromoly. Never an issue from any of the lighter guys.
We were usually pretty hesitant to really hammer on them, had to get to class on Monday.
Even when we went hard on stuff, we very rarely have anything bound up, too much sand and dirt on everything to give us enough grip. Most of our destruction comes from an axle hopping.