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Message: [QUOTE="Charles, post: 682793, member: 103"] No. I'm not offering an opinion.... like, I think an auto is better because it feels smoother when I drive, or because I would rather not shift myself, or because I don't like manual transmissions and they aren't cool, blah, blah, blah... Those would be examples of opinions, and the type of info you've offered thus far. Stories about cool guys driving manuals, harley sounds, blah, blah, blah. What I've offered is objective data. [i]Actual[/i] transmission ratings as provided by the people who manufactured them, [i]actual[/i] relationships between engine torque and available output torque (total multiplication ratio), ability to transfer torque over an rpm range (torque converter function), stall torque capacity (starting off on a hill), continuous power capacity both as specified by the manufacturer, and as field tested via multiple experiments with similar outcomes, so on and so forth. My opinion is that a full auto is junk, a manual somewhat better, and a full manual-auto the best option. That opinion is based on data in part listed above. I do not expect anyone to accept anything because I say so. That is 100% the opposite of what I expect. I expect people to accept things only when they make sense, and all available data supports that conclusion. When someone brings forth data that contradicts my conclusion based on other data, and it is found valid, you will see me accept a new conclusion, as you have before. When people offer nothing but feel-good bs and preferential crap, you will see no value given to their points, as their points have no [i]support[/i]! 1000hp would not kill one.....for a short burst. A ZF6 might hold a smooth 2000hp for all I know. If you kept the rpm up it might hold 4000hp! But somewhere around 300hp or less for any extended period of time, and the unit cannot shed the heat. Myself and at least one or two others have given direct field experience with this fact. ZF themselves would not rate the unit any higher than 520lb/ft in 2000. It was explained in another source that the unit having 6 complete gearsets in constant mesh the whole time the unit is in use creates a lot of heat. It's entirely possible that the damn thing simply [i]generates[/i] more heat than the 4R with a couple planetary sets engaged and the converter locked. Nevermind the tremendously higher ability of the 4R to move and radiate away that heat. If you ran a ZF6 behind a brand new 6.7 at 400hp ~350rwhp, and actually matted that truck with a solid load, with bad aero, you would see the end of a ZF6 with a bone stock pickup truck engine. This is why it is not available behind that engine. Preference and all that be damned... the thing can't measure up. [/QUOTE]