Clutchless shift on ZF6?
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Senior User
Joined: Dec 2007
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Clutchless shift on ZF6?
Can anyone confirm or deny whether or not its bad to shift without the clutch on these? I've read around quite a bit but can't seem to find a for sure answer. I drive semi's for a living and understand there is a total difference in straight cut gears and a tranny with syncros on it. I caught myself accidently doing it out of habit the other day in the 7.3 and was just wondering if it is detrimental to the tranny/syncros on a Stroke? I can go 1-OD and OD back down to 1 without grinding but not something I want to get in a habit of if something else is taking up the slack in there?
Hotshot
Joined: Dec 2005
Posts: 14,377
Likes: 607
From: evansville in
Up to od AND back down with NO clutch....you ARE the man!!! I could when i had a stick sometimes..some vehicles better than others..if its not grinding..im of the opinion it is better than wearing the clutch for so many shifts.at least thats what my dad always said.
Lead Driver
Joined: Dec 2012
Posts: 7,877
Likes: 49
From: Tennessee
I am of the opinion the others have stated . If it ain't grinding , no harm . I actually do the same in my old kia at times . 150k and some change , factory clutch ( despite my wife's driving ) and no problems yet .
Elder User
Joined: Nov 2004
Posts: 829
Likes: 0
From: Syracuse, NY
It doesnt take long to ruin the syncros shifting a zf6 with out clutching, I suggest you clutch for every shift.
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
If it doesn't grind when shift and you are not forcing it into gear, then you are hurting NOTHING. I put over 150k on my 2000 with ONLY using the clutch to take off from a stop. Never used the clutch again
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