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Message: [QUOTE="B585Ford, post: 585060, member: 5497"] I guess some people have just been unlucky. I have a lot of faith in the ZF6. I have been tuned with a SB clutch for over 40k miles. The last 12k miles have been at the 600-650 RWHP range (mods in sig). I have had NO issues with the tranny. That includes several thousand miles of towing 12-16k. I am not aware of anyone with the 6.4 who has had problems with the ZF6 (besides the stock clutch) and they are tuned....HD-Teh.., Johnny77Mutt, Dozer, and a few others (I think SuperDutyFarmer also was in the 650 range and I hadn't heard of any problems from him). I haven't heard any reports lately, but a guy from Jersey (can't remember his screen name) dynoed over 800 RWHP with his ZF6 which was stock except the clutch. That was a single. He went to compounds and made more HP, but I haven't seen a post from him lately so I don't know if it has held. I do know his old version 3850 did start slipping with the compounds, but the tranny was holding last I heard. [/QUOTE]

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