They use the stock hydros in the V8, they hold up, but they do blow the pumpsI have been to a few tractor pulls but has been a long time. There are none close her and I have not seen any in Australia.
I have one question. What do the use for a rear end? I would think that would blow a JD rear end. But then what do I know. I have rebuilt engines but never done anyting like that. That is one fine puller.