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This spring I went full hydro on an 4.0 XJ with a double ended ram. I started off trying to make the Xj pump live. Did the 4.5" PSC pully, and the west texas offroad mod to make the pump flow better (google it), with a big filter and cooler. I killed a pump each of my first two trips. I would suggest at least adding a big remote reservoir, much bigger than the stock integrated pump. I think I kept killing pumps because I was starving them. I finally went with a PSC pump and couldn't be happier. Probably not what you wanted to hear, but I hope it helps.
jim
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