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Message: [QUOTE="Binder man, post: 678502, member: 9771"] Originally Posted by stroker2 you obviously have never met charles... While I do enjoy shifting gears. What he is stating is the truth. These transmissions are rated for 650 ft. lbs of CONTINUOUS torque. Most of you guys will NEVER put 650 ft. lbs. of continuous torque through one. Imagine going up a 7-10% grade with 35K gross, now say your truck is 300 HP TO THE WHEELS and you are holding it to the floor just to maintain 60MPH in your 300HP tune, and do this for a few hours. A ZF cannot handle that, but 99.9% of you guys will never do that. Now say that you do and you don't want to hurt it, find a way to make the ZF cool itself. You would need a external oil supply because the case cannot hold enough along with a few pumps and multiple coolers. But not to much of a pump or you wont get the full cooling effect of the oil, it will pass through the tranny to fast and not absorb any heat. On the same lines as this I know a guy that ran a spicer twin stick in a 84 KW 3408 making 850+HP back in the day. With a individual cooler for both trannies and a individual gauge for both trannies. Going up grade he would have to take one out of O/D and shift the other into O/D while the other cooled off and go back and forth to keep from melting a Spicer tranny down. Call him stupid, but that company ran the fastest trucks on the road at those times, and he never melted down another spicer. [/QUOTE]

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