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Old 02-06-2014, 07:27 PM
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ZF5 problems

This summer I rebuilt the ZF 5 speed transmission in my 96 F250 psd. When I take off in first gear at idle it has a "growl" to it, but if I take off in first at about 1,000 rpm there is no noise. Any ideas on what is causing the growl? I have heard that it is a fairly common problem. Also, the motor has 353,000 miles on it, idk if that matters or not. Any advice would be greatly appreciated!
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Old 02-06-2014, 07:38 PM
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Do you have a Single Mass Flywheel and clutch in it? If so, it's probably what we call "gear rollover noise" and is much more noticeable with the SMFW. My ZF factory reman'ed tranny did the same thing. Cheers!
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Old 02-06-2014, 08:13 PM
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I'm not sure, how would I be able to figure that out?


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Old 02-07-2014, 06:11 AM
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Yo would need to remove the inspection cover. The Dual Mass Flywheel will have 2 masses that can be slightly counterrotated against each other (about 5/8") and the dampening springs are located in the flywheel instead of the clutch disk. The SMFW will be a one-piece flywheel with the dampening springs in the clutch disk hub instead of the flywheel. Cheers!
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Old 02-07-2014, 06:22 AM
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Ok, then it is certainly a SMFW, so the noise is nothing to worry about then? The transmission shifts good, no grinding or anything.


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Old 02-07-2014, 07:02 AM
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If it is only down at very low (almost lugging) RPMs, then you should be fine. Cheers!
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Old 02-07-2014, 07:30 AM
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Yeah it is, thanks! I am assuming that a Dual mass clutch has better performance? What would be the advantage of switching clutch types?


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Old 02-07-2014, 08:32 PM
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No, the Dual Mass are problemmatic, expensive, and are a weak point. Most folks end up with the single mass setup. You do get increased gear rollover noise, but its a truck! I just learned to live with it and not lug around as much. Cheers!
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Old 02-07-2014, 08:34 PM
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Haha ok, thanks for the info!


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Old 02-08-2014, 07:44 AM
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There is no "dual mass clutch". A dual DISC clutch is a performance upgrade, one that really isn't worth considering unless you're pushing a LOT more horsepower out of the engine. A single-MASS FLYWHEEL is a remedy for the peril of the dual-mass coming apart and grenading your tranny. Two completely different parts, either of which can be dual or single.
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