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clunking noise
03-05-2014, 04:50 PM
Post: #1
clunking noise
I have this clunking noise in my GMC sub. k2500 7.4L not sure where it is coming from just happens intermittently while driving I have noticed that it happens more while cold then after driving for a while, does not seem to happen weather turning or going straight it has no preference it just happens when it wants I have taken it to the shop but like when you make an appointment at the doctors the problem goes away even after a 20 minute test drive still would not do it.

don't know where to start any help would be appreciated

thanks

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03-05-2014, 06:51 PM (This post was last modified: 03-05-2014 06:52 PM by Rupe.)
Post: #2
RE: clunking noise
Need more info.... front, rear, left, right, fast, slow, driving over bumps, or on smooth road? One bang or repeated clunks? Can you make it do the noise again? What year is it?

Do you have a bowling ball in the trunk? (have seen worse)
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03-06-2014, 07:05 AM
Post: #3
RE: clunking noise
ok it is a 93 with 230,000 miles some times it sounds like it is coming from the rear sometimes the front right just had front wheel bearings changed thought that may be the problem but continues. I do notice it more often on bumpy roads then smooth ones but it will do it while driving the expressway no set speed of when it happens but when on the highway it will only happen about every 10 or 20 miles. it is like a little hiccup no big jerking or anything like that, and the engine runs smooth could it be the rear axle or the transfer case. hoping not for either of those can be a pricey fix even for a diy'er like me. changed the rear u-joints doesn't seem to make any difference on what I change and summer is just around the corner and trying to get it ready for camping season. hoping for a great summer. lol

and no I have no bowling ball in the trunk I wish it was that simple

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03-06-2014, 10:56 AM (This post was last modified: 03-06-2014 10:58 AM by Rupe.)
Post: #4
RE: clunking noise
Anything related to gears will proabably make noise all the time. Any bearing that clunks will be making other noises too. Could it be something easy like a set of tires with lots of tread and a small rock flies out once you get some speed on the highway?
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07-29-2015, 02:19 AM
Post: #5
RE: clunking noise
Sorry forgot aboutabout this post.
Any way it ended up being the transfer case chain and pump replaced ita couple of weeks after this post.


ran fine.till a month ago. Now is making worse noise and more often inspected the rear diff found chunks so ended up replacing the diff housing. Tip find out it was not the problem this time have only used the 4 w.d. 2 times in snow so can't see this being the problem. Only does it while driving had it on a hoist. Running 60 mph. For 10 minutes. No noise no clunks front shaft is out.well not do it if i speed up put in neutral. And coast even from 65 70 mph. Transfer case was only abouta quart low starting to think front diff. Input please

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07-29-2015, 09:15 AM
Post: #6
RE: clunking noise
Should be easy enough to drain the front diff oil and see what comes out. Put a piece of screen or a rag under the oil flow to catch any pieces or particles and let us know how that looks.

Gotta ask why the transfer case was that low if someone had it apart to do the chain? A quart low on oil may have caused some damage. They don't hold that much in the first place.
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09-16-2015, 07:09 AM
Post: #7
RE: clunking noise
Ok update embed up changing the rear differential housing clutches and locker ring and spider gears were shot thought that was my problem.just to get it back together to find out it wasn't has gotten worse front d shaft is out the only thing i did not do was the pinion bearings. Clunk at times is a Loud bang enough to shake the truck. Abs engages at slow speed stop like less than 5 mph.like some thing is binding up.could out be trans mount or slip yolk or both. Still have not had time to drain the front diff hopefully this weekend.

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09-16-2015, 10:00 AM
Post: #8
RE: clunking noise
Does this have the exposed u-joints out behind the steering knuckles with the automatic locking hubs for the front wheels? This would be the front end that's solid and looks like a rear end housing, not the fully indepenent front suspension with CV joints. At 230k miles it's well overdue for new u-joints and a good going over on those locking hubs. If the hubs hang up they will screw with the front dif and wear things out like crazy. I suspect you will have to tear it down till you find your worn parts.

On the ABS issue, the most common cause there is a weak sensor or one that has too much rust behind it causing the probe end to be too far back from the reluctor teeth. You wind up with a weak signal and the computer thinks the low input is a wheel that's not turning fast enough. The sensor for the rear wheels is in the transmission so in your case it's going to be one of the front sensors. Oh, the exposed sensors on the older vehicles do get covered with crust and rust externally, which will cause a weak signal. You can try cleaning them first to see if it helps.
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