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Message: [QUOTE="Binder man, post: 679291, member: 9771"] They do it to maintain speed with the load. I'm not trying to get into a pissing match, but what charle's is saying is 100% true. 300HP really isn't that much to ask for when towing, considering the new motors are 400HP from the factory take in driveline loss and your still at or above 300. Have you towed with a new one compared to 7.3? Theres so much difference its not funny. Even a 6.4 will walk a trailer where 7.3's will bog down and lose speed. I'm not dogging the 7.3, obviously as I have/had plenty of them, there still my top choice. But on a good day a stock 7.3 might make 200 to the wheels maybe. Thats why guys with a chip never have problems because there tow tune would be lucky to be at 240. Now throw a set of 400/400's big oil and twin turbos in a truck with a zf6 that can make 600HP, idle like stock, and never get hot dragging whatever weight you want, and you start melting ZF's and U-joints and carriers. Truck pullers use their power for MAYBE 10 seconds at a peak, hence why they don't have issues. You guys are comparing apples to oranges with charles. Guys with stock trucks and a ZF even with a tune that you can hold to the floor with a good load and never get hot will never have a issue with these trannies. Yes you do have a oil cooler for that ZF but it's simply not enough for a high horsepower truck. A ZF holds very little fluid whereas a 4R will hold 4 gallons or more if it is dry. Then add a GOOD cooler like a 6L trans cooler compared to the factory excuse for a cooler on a ZF. Which is why I say to make a ZF hold you need to have a external oil supply that will hold at least that of a 4R to ever give it a chance at living behind a high horsepower truck. Along with a adequate cooler of some sorts. [/QUOTE]