ZF6 Breakage? - Ford Powerstroke Diesel Forum
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Old 04-11-2011, 02:16 PM
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ZF6 Breakage?

The rear housing on my 6 spd transmission has broken for the second time now. Any ideas as to what might be causing this? The housing is breaking close to the transmission mount. I replaced the mount the last time because it was worn out. I hoped that was what was causing the problem but it just broke again. I haven't been towing anything or putting the truck under any stress either. Any ideas would be greatly appreciated. Thanks. Tim
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Old 04-11-2011, 06:32 PM
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I accidentally posted this in the wrong place. Anyone know how to move this over to the transmission problems section.
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Old 04-11-2011, 06:36 PM
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Can you take some pics? Maybe you didn't have your thrust clearance right when you put it together last time.
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Old 04-12-2011, 02:45 PM
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Not sure what kind of pics you were wanting but here are a couple of the crack itself. It cracked in the same location last time. It is just in front of the transmission mount.
Attached Thumbnails
ZF6 Breakage?-tranny-crack-1.jpg   ZF6 Breakage?-tranny-crack-2.jpg  
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  #5  
Old 04-12-2011, 03:36 PM
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I'd just have it welded back up. Don't know what your problem is.
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Old 04-20-2011, 09:49 AM
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I'd check your engine mounts. The source might be further upstream of the transmission.
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Old 04-29-2011, 06:33 PM
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Well I've finally got the transmission out. The only problem I found was the pilot shaft bearing was worn out. Don't know if this may have been the cause or not. I really hope to find the problem before reinstalling it because it is not a cheap or easy fix. Thanks to everyone for their ideas.
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Old 04-29-2011, 07:42 PM
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I doubt that a piolot bearing would cause your problem since the crack is at the back of the case.
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Old 05-03-2011, 05:56 PM
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I read a service bulletin somewhere that was saying, If you remove your trans with the Xfer case still attached it can lead to tailhousing failure....Just an FYI
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Old 05-03-2011, 05:57 PM
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By adding stress to the weaker tailhousing
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