Intolerable "clunk", please help - Ford Powerstroke Diesel Forum
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Old 10-23-2013, 07:11 PM
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Intolerable "clunk", please help

I have a 2002 f350 with a zf6 and I'm getting a loud and very firm clunk any time I put a load on the enigne

I'm not sure if it's coming from the act of putting a load on the engine or from the suspension rocking back and forth.

It's worse in reverse and when going up hill. I thought it was the sway bat but I was wrong there

This sound is driving me crazy and I NEEEED help

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Old 10-24-2013, 02:03 AM
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have you greased the slip joint on the two drive shaft halfs? This is a common clunk these trucks aquire over time that a grease job will cure.
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Old 10-24-2013, 02:15 AM
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Also check the u joints. Is it like one clunk and gone?
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Old 10-24-2013, 03:12 AM
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Check your front wheel hub bearings by grabbing the U-joint and if it has alot of play in it when lifting it up and down, this will cause a loud clunk noise as well. You should have very slight play in it but not much.
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Old 10-24-2013, 04:14 AM
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I remember greasing the drive line a while ago but it very well could be that.

I have checked and greased the u joints and they are in decent condition

The hub is one thing I completely forgot to check. I've been so busy that this problem is just causing more headaches

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Old 10-24-2013, 04:40 AM
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It also does it when I first start the truck right at the end of the starter turning and right when the engine takes over

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Old 10-24-2013, 05:04 AM
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Have you checked the motor mounts?
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Old 10-24-2013, 05:14 AM
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[QUOTE=charlie.thomas;7009209]Have you checked the motor mounts?[/QUOTE

Other than a visual inspection, I'm not sure how to
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Old 10-24-2013, 09:10 AM
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If you had the hood up, while you were sitting in the truck you could crank it and look through the gap of the hood and see if there is a lot of movement of the motor or have someone get in and put it in gear and rev on it with the brake on putting the motor in a bind and see if the motor has a lot of "torquing" and listen for the clunk as well.
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Old 10-24-2013, 12:22 PM
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I'm leaning towards it being a motor mount but I didn't think they were a real problem on these trucks
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