Intolerable "clunk", please help - Ford Powerstroke Diesel Forum

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post #1 of 29 Old 10-23-2013, 07:11 PM Thread Starter
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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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post #2 of 29 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.

2002 F350 CC Auto 2x4 SRW SB
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post #3 of 29 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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post #4 of 29 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.

"Feel the Fear and Do It Anyway"
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4" Turbo back straight exhaust
SCT Livewire TS tuned by the best, "Tony Wildman"
New block bored .020" over
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post #5 of 29 Old 10-24-2013, 04:14 AM Thread Starter
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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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post #6 of 29 Old 10-24-2013, 04:40 AM Thread Starter
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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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post #7 of 29 Old 10-24-2013, 05:04 AM
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Have you checked the motor mounts?

"Feel the Fear and Do It Anyway"
2007 F250 King Ranch
Alligator Performance EGR Delete
5" AFE air intake
Blue Spring Mod
High Idle Mod
4" Turbo back straight exhaust
SCT Livewire TS tuned by the best, "Tony Wildman"
New block bored .020" over
New heads ported, polished, and decked
ARP Head studs
And other goodies
Lifted on 35" Toyo Open Country MT


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post #8 of 29 Old 10-24-2013, 05:14 AM Thread Starter
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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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post #9 of 29 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.

"Feel the Fear and Do It Anyway"
2007 F250 King Ranch
Alligator Performance EGR Delete
5" AFE air intake
Blue Spring Mod
High Idle Mod
4" Turbo back straight exhaust
SCT Livewire TS tuned by the best, "Tony Wildman"
New block bored .020" over
New heads ported, polished, and decked
ARP Head studs
And other goodies
Lifted on 35" Toyo Open Country MT


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post #10 of 29 Old 10-24-2013, 12:22 PM Thread Starter
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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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