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Message: [QUOTE="psduser1, post: 1547637, member: 735"] Imo, the power is the easy part. 400hp is pretty simple, I've been towing at that level-ish (never dynoed) for about 200k miles, on simple mods. Injectors (160-180/80,100% ) 38r, decent intake, tunes, and aftermarket single hpops, in two trucks. One truck has always had something wrong with the turbo, never checked it out to see what the problem is. Gotta watch the egts in that truck. The other truck-id let you take off with 25k hooked to the back, and not think twice about it. One manual, the other, automatic. And yes, 25k, many many times. The bigger issue is going to be brakes, or lack of. Suspension is marginal, but airbags will take care of most of that. The transmissions will limit you, as well. I've been thru a couple of zf 6, but a 6.0 trans cooler has helped that issue dramatically. With a zf5, you'll only go thru clutches quicker, lol. I really think the optimal setup would be a 4r with a programmable aftermarket controller, and an increased maintenance schedule to keep the oil happy. I really think that over 4-450 hp, you are going to hurt yourself, from a durability standpoint. Of course, compounds, big oil, etc would be fun. In fact that is all on my shelf at the shop, and not in the truck, for a reason. [/QUOTE]

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