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Message: [QUOTE="B585Ford, post: 1075607, member: 5497"] To the best of my knowledge, no one has dynoed on an accurate dyno with stock fuel the 75/59 or the 76/59. Chris runs a F450 with 75/59 is very happy with it, but he only has a few thousand miles on it and obviously the gearing is a good bit different that you. Since you tow a good bit of weight, spool up is important. I really like my 15% nozzles, 76/stock VGT because spool up is so good. When I am first accelerating, the EGTs get hotter quicker, but when cruising, they seem to be a little lower than my old stock fuel and 71. I am guessing if I go to a 59, the initial EGT rise won't be as much. With all of that said, my old 71 did great towing heavy and was very reliable (never an issue). IIRC I had about 25k miles and at least half were grossing 24k-32k. I haven't seen many failures on the drop ins from RCD or Elite so I assume the 75/59 will hold up pretty well. Not sure about the shaft size. As you probably have seen already, the 75 does run a different turbine. According to Morgan, the turbine helps to keep EBP down. I have never seen any data on EBP with the 75/59 on stock fuel. [/QUOTE]

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