ZF6 clutch engagement - Ford Powerstroke Diesel Forum
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Old 04-24-2012, 05:41 PM
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ZF6 clutch engagement

Just bought an '01 F350 7.3 CCSB 4wd with the ZF6 tranny and 157k. PO said he had a new clutch put in a few yrs ago but doesn't know what brand/type but that it was a stronger clutch than factory. The tranny shifts fine but it is very difficult to let the clutch engage smoothly. When depressing the clutch pedal the first half of the throw is firm and the second half is less firm. So when letting off of the pedal it is tough to let it out smoothly. So on every shift there is a clunk that sounds like it is coming from the clutch. 5-6 shift is the best as the speed of the truck is higher.

Maybe the pressure plate spring rate is at fault? Maybe its u-joints?
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Old 04-26-2012, 04:39 PM
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sounds like u joints to me i would deff replace them thats a easy fix compared to spending all that time yanking that zf out.
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Old 04-27-2012, 09:47 AM
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Check the joints first but I'd say it's possible that it needs a clutch. It should get harder the farther you push it down not easier. I've had several of these with zf6's and they all seem to have a little slop in them so it has a clunk when you shift. You sort of just gotta get used to how it shifts.

Put all the southbend stuff in it and you'll never have to worry about it again.


Sent from my Autoguide iPhone app
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Old 05-02-2012, 05:55 AM
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i heard southbend warrantys there stuff just as well as ats warrantys there transmissions. thats why i went with a kennys i got a dual disk cheaper than a single con-ofe
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Old 05-02-2012, 06:36 AM
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I put a Valair in my '06 Dodge. It was a good clutch and better priced too.
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