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Balls Under Bed ?

petrolhead_k

By petrolhead_k
in Troubleshooting & Recalls

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petrolhead_k Enthusiast

petrolhead_k

Posted
Posted

Hi Guys!

 

I've tried to search for this issue, found one or two posts that are close, I'll be taking my truck soon to the dealer hope someone can shed some light plz.

 

2015 GMC Sierra Reg cab - mileage just under 2k.

 

Every time I decelerate to a stop I hear 2 knocks under the bed, over time it's increasing and getting louder and can't be ignored. This only happens when I come to a stop when driving slowly. Stopping from high speeds does not produce that noise.

It also happens when I reserve slowly and stop. (Always happens during reverse) It's feels more of a roll-knock kind of sound. It's always 2 knocks and there is a slight pause in between both. Anyone has a similar issue ? Fixes ?

 

It's not from the transmission - does not feel like it is. Could it be brake system ? Maybe suspension ?

 

Of course I have the common seat issue, moves and cracks at turns.

 

Shame some issues are repeated for the 2015 models.

 

Thanks guys.

 

 

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bdbake01 Senior Enthusiast

bdbake01

Posted
Posted

Recently I've noticed a couple of odd noises similar to what you describe and under the same conditions. I'm suspecting the rear brakes, possibly axle, but it's faint and I've only heard it a handful of times making me doubt that it's even the truck in the first place. Calipers sliding around? Pinion lash moving? U joint popping? LSD acting wonky? I dunno.

petrolhead_k Enthusiast

petrolhead_k

Posted
  • Author
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I just got back from the dealer. Gave in the truck. I was able to duplicate the sound. They did hear it. His initial diagnosis was it was from the rear leaf / shackles, that it moves slightly. Not sure about that. But could be a possible issue.

It's been increasing lately, it was a one two time thing, but now it's on every time I stop now.

 

 

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BigBadSierra Senior Enthusiast

BigBadSierra

Posted
Posted

I just got back from the dealer. Gave in the truck. I was able to duplicate the sound. They did hear it. His initial diagnosis was it was from the rear leaf / shackles, that it moves slightly. Not sure about that. But could be a possible issue.

It's been increasing lately, it was a one two time thing, but now it's on every time I stop now.

 

 

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Still check the spare and lower it down.

 

I somehow got a rock in mine not a stone a rock over and inch in diameter it was rattling and rolling around in the spare rim.

 

It took a heck of a bounce to get up there for sure.

 

.

pm26 Senior Enthusiast

pm26

Posted
Posted

I suggest checking various nuts and bolts for tightness. I would check the brake caliper mounting bolts, spring mount bolts, shock mount bolts, trailer hitch mount bolts and any nut and bolt you can see. Loose bolts from the factory appear to be a common issue on some of these trucks.

TJay74 Senior Enthusiast

TJay74

Posted
Posted

My truck made noise when I first got it. I crawled under it with my sockets and tightened up the shackles and it went away.

DanielAcosta Enthusiast

DanielAcosta

Posted
Posted

Besides being a loose spare, which I actually had on mine, you might also have rocks trapped above your frame rails somewhere. I've had this before, but it was more of a rattle; your clunk seems to be more of a suspension noise to me.

tbare54 Enthusiast

tbare54

Posted
Posted

Just curious, is your truck a regular cab with the long bed. If it is, it has a 34 gallon fuel tank without baffles in it. Thus you might be feeling and hearing the fuel slosh back and forth, especially when you have a full tank.

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

Sounds like the driveshaft yoke. To eliminate the transmission from the cause, shift to neutral before braking and see if it does it. If so, it could be the driveshaft ... or possibly the springs mentioned above.

petrolhead_k Enthusiast

petrolhead_k

Posted
  • Author
Posted

I just got my truck my yesterday.

They said its from the leaf/spring set. That it's moving horizontally back and forth with breaking. They called me I went to pick it up.

 

The lower the leafs, greased it. And re tightened all bolts. They said the sound was all gone.

Trying the truck, the sound is there. But much lower that i brought it in.

So I assume it is from the leaf but they haven't gotten to it yet. I spoke to any other dealer, they told me it's normal and goes after time with usage.

 

I don't think it's normal. I don't like it either. It's much lower that it was, so I'll drive it around for another 2k miles and see what happens.

 

As for the seat and seat bracket. They greased and re tightened . Sound and crackles came back after a few sharp turns.

 

Love the truck. But can't understand some of the final touches made.

 

Is it true they are changing the leaf design/ quality for the 2016 ??

 

 

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petrolhead_k Enthusiast

petrolhead_k

Posted
  • Author
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Update: 2 days later same issue. And even worse.

 

Has anyone come across a fix?

Shackles/leafs - I can't really tell what's faulty.

 

 

 

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EaZ8 Enthusiast

EaZ8

Posted
Posted

Update: 2 days later same issue. And even worse.

 

Has anyone come across a fix?

Shackles/leafs - I can't really tell what's faulty.

 

 

 

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serious question, whats the weather like?

on our first snowfall of the season i was getting some horrible noises that sounded like rattling wiring that i thought was in the headliner. it turned out to be a bit of ice stuck between the cab and the box and i guess the truck has a little flex in it when accelerating and stopping which made it rub and make weird noises.

petrolhead_k Enthusiast

petrolhead_k

Posted
  • Author
Posted

No ice here or extreme weather conditions. I went off-road and abused the truck for 2 hours. Then the rest of the night and the next day the thump sounds were all gone.

After driving on normal road for a long drive 2 hours - the moment I stopped, it came back.

I'm not convinced that it's normal as stated by the dealer.

 

 

 

 

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