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  #1  
Old 02-02-2013, 04:34 PM
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nakman nakman is offline
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Default Name that clunk!

This clunk has been getting progressively worse for the past 3-4 months. It's to the point now where it should be obvious, but I can't seem to nail it down. It happens exactly once every time I drive the 100, unless there's lots of forward/reverse in which case I can get it to clunk each time the direction reverses. But only if gas is involved... if I just coast down the driveway it doesn't clunk, it's only if I give it some gas when hitting reverse.

So far I've checked:

-Driveshaft bolts
-Tires, lugs are tight
-Wheel bearings (no play when trying to wiggle tire)
-Brake pads (they look fine, and aren't cracked). they do however have a tiny bit of play, as if I could maybe fit one more shim behind them, but that wouldn't cause this clunk
-Caliper bolts - freshly tightened, and they were tight before. I really thought it was a loose caliper though, as that's exactly what this clunk feels like
-Sliders - Not interfering, and u-bolts are tight

will see if I can get some movies to upload... you should be able to right click, then save target as.

movie#1 from outside the vehicle
movie #2 from under the front bumper (sorry about the upside-down, I'm sure there's way to flip that but I didn't want to get into it)
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Last edited by nakman; 02-02-2013 at 04:43 PM. Reason: got vids to load
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Old 02-02-2013, 05:02 PM
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Wow, that's quite a clunk, or more of a snap? Do the motor mounts look healthy? Tranny mount? I like the videos.
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Old 02-02-2013, 05:15 PM
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Yeah they look ok, at least the ones I can see.

What's peculiar is it's only one time.. after whatever is moving settles into its spot for either forward or back, you can drive 100 miles and never hear it again. Heck I drove 150 miles on Wednesday and only heard it once, when I was leaving the house for the first time, then once more when I backed out of my spot in Ft. Collins. It's only when you switch directions that you get it one more time. So if it were a bad motor mount, tranny mount, or even a loose u-joint or driveshaft or broken CV, I'd hear it a lot more than just once, right?
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Old 02-02-2013, 05:51 PM
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Have you checked all your suspension parts. Seems like a change in direction my cause a shock mount or link to resettle and clunk.
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Old 02-02-2013, 06:00 PM
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I have heard brake pads make that noise. Driveshafts too. Try pulling apart the shaft and lube the splines.
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Old 02-02-2013, 06:06 PM
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I did grab the shocks and try to move them, but couldn't. However they were fully extended at the time...

I've squirted grease into the DS zirks recently, but haven't ever pulled them completely apart. that could be it, thanks Justin I will try that, should do that anyway.
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Old 02-02-2013, 07:49 PM
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I had a noise that Christo said was due to the sliders hitting the underside. They used a crowbar to bend up the metal above the slider mount. Think you used different sliders though
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Old 02-02-2013, 07:51 PM
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How about a front axle joint?
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Old 02-02-2013, 07:57 PM
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Also, my front drivers shock bolt came loose. Have you pushed down on the front end from both sides of the bumper? I finally lock-tighted it as it came losse a couple of times
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Old 02-02-2013, 10:43 PM
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My 80 had a clunk which behaved exactly like you describe. Turned out to be worn splines on the rear driveshaft, causing enough rotational play to clunk on change of direction under load. It was diagnosed and repaired by Bill at Bill's Englewood Driveshaft with a driveshaft rebuild. Hasn't repeated since.
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