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Message: [QUOTE="Charles, post: 639722, member: 103"] Fully built ZF...No such thing. I don't have a breakage problem, it's a heat problem. I installed a big cooler in addition to the factory cooler on the last OEM ZF6 I put in the 550. No shaft material is going to make the thing not melt down. They don't break, they melt down and start popping out of gear. I run the same valvoline trans fluid in the ZF that I run in the 4R. I run a factory cooler ONLY on the 4R, nothing additional, and by all accounts my BTS should run hotter than a factory 4R all else constant. The 4R has taken hundred(s) plural, [i]more[/i] horsepower continuously without so much as one damn being given thus far in terms of towing. [/QUOTE]

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