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LMC Truck



Username Post: Clunking in Rear        (Topic#347704)
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
10-16-17 07:40 PM - Post#2711084    

After about a month of ownership my new 1500 Silverado LT has developed a loud clunking from the rear when going over some bumps. It's most prominent when backing out of my driveway. When I would jump on the back of the truck to replicate I could only get a slight squeak from the leaf springs but that didn't seem like what I was hearing. If I grab the back corner of the bed and pull towards me back and forth so the truck starts twisting it seems to replicate the sound coming from where the leaf springs connect to the front bracket.
Has anyone noticed anything like this on their trucks? I doubt anything is worn out so quickly. I do plan to call the dealer this week.

I didn't notice it until after a trip to drive around my hunting spots in the woods. I did use 4wd once but did nothing that should cause any undue strain on a truck that should be made to handle responsible off-road use.

2017 Silverado LT All-Star
5.3 V8
4WD


 
LMC Trucks
elcamino 
Dedicated Enthusiast
Posts: 5318
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
10-17-17 03:24 AM - Post#2711105    
    In response to james 14

Might be a characteristic of a truck that is not carrying a load. Try putting a load in the bed, 300-500 lbs and see what happens.

I have owned pickup trucks for many years and clunking rear springs are not unusual. Even my 2015 Sierra Denali did occasionally but once I put on a fiberglass capped the noise was never heard again. Its often the lower (overload) spring slapping the leaf above it when the rear goes over a bump.

Mike
2017 GMC Sierra Denali Ultimate 6.2L(420hp)/8-sp
2016 Polaris RZR 900 EPS


 
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
10-20-17 05:26 AM - Post#2711466    
    In response to elcamino

Seems to be something they'd have worked out by now. It is 2017 after all.
I'm about 95% sure I didn't notice it for the first month of ownership...which means something changed. I hear it now on both leaf springs. I'm not inclined to think it's something wrong if it's both sides. It is obnoxious, however.

2017 Silverado LT All-Star
5.3 V8
4WD


 
elcamino 
Dedicated Enthusiast
Posts: 5318
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
10-21-17 03:44 AM - Post#2711563    
    In response to james 14

I found this bulletin.....

Subject: Clunking Noise from Rear of Vehicle (Re-torque Leaf Spring Bolts)
Models: 2007-2017 Chevrolet Silverado
2014-2017 Chevrolet Silverado 1500
2014-2017 Chevrolet Silverado 2500/3500
2015-2017 Chevrolet Colorado
2007-2017 GMC Sierra
2014-2017 GMC Sierra 1500
2014-2017 GMC Sierra 2500/3500
2015-2017 GMC Canyon
Attention: This Bulletin also applies to any of the above models that may be Export vehicles

Condition
Some customers may comment about a clunking noise
coming from the rear of the vehicle. Upon further
investigation, the technician may diagnose the noise
coming from the rear suspension leaf spring area.
Correction
The noise may be resolved by re-torquing the joints of
the leaf spring assembly.

for more info see bulletin link below.....

Clunking Noise from Rear of Vehicle (Retorque Leaf Spring Bolts) – (Apr 12, 2016)

Mike
2017 GMC Sierra Denali Ultimate 6.2L(420hp)/8-sp
2016 Polaris RZR 900 EPS


 
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
10-30-17 01:08 PM - Post#2712728    
    In response to elcamino

I wondered if that may be the case but thought surely a brand new truck wouldn't need bolts tightened.

2017 Silverado LT All-Star
5.3 V8
4WD


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2252

Age: 31
Loc: Utica ny
Reg: 04-13-10
10-31-17 03:39 PM - Post#2712867    
    In response to james 14

I was thinking loose Ubolts also.
Have seen it before.
Just because it is new doesnt mean it is fine.
There is alot of flexing and vibration and occasionally they will come loose enough to allow the springs to move and or creak

Old School GM fan FOREVER


 
elcamino 
Dedicated Enthusiast
Posts: 5318
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
10-31-17 04:15 PM - Post#2712871    
    In response to james 14

They are probably not loose but some may have been improperly torqued on the assembly line. When the chassis is built it is upside down to make installing the suspension easier. Then its flipped over to add the engine etc.

Mike
2017 GMC Sierra Denali Ultimate 6.2L(420hp)/8-sp
2016 Polaris RZR 900 EPS


 
KShortell 
Senior Member
Posts: 4032
KShortell
Loc: Chesapeake, VA, U.S.A.
Reg: 04-14-01
11-07-17 06:16 AM - Post#2713556    
    In response to james 14

I get that every now and then. However, I figured out that it wasn't the TRUCK, it was the drawbar in the receiver hitch. Just something else to check. If you have one, pull it and see if it stops.

Good luck!

Semper Paratus
FL05-03 Home Page
Stock is not a dirty word...


 
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
11-12-17 10:54 AM - Post#2714149    
    In response to KShortell

I took the truck in and had it "fixed" per the TSB and there is quite literally no change. It's not even the clunking but the springs are squeaking. I'm think what the hell this is a brand new truck that sounds like a clunker. I was hoping to have this thing for the next 15 years or so. I'm barely 3 months in.

2017 Silverado LT All-Star
5.3 V8
4WD


 
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
12-05-17 08:17 AM - Post#2716944    
    In response to james 14

Truck has been back at dealer for a few days now. GM told them to lube all connections but that didn't work so now they're seeking permission from GM to completely replace the leaf springs.

2017 Silverado LT All-Star
5.3 V8
4WD


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2252

Age: 31
Loc: Utica ny
Reg: 04-13-10
12-05-17 07:06 PM - Post#2717002    
    In response to james 14

hmm.
Keep us posted

Old School GM fan FOREVER


 
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
12-07-17 12:40 PM - Post#2717206    
    In response to james 14

They replaced one set of leaf springs. They had a pic and it was clearly misaligned. I was concerned they only did one side but after two days the noise appears to be gone.

2017 Silverado LT All-Star
5.3 V8
4WD


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2252

Age: 31
Loc: Utica ny
Reg: 04-13-10
12-07-17 06:30 PM - Post#2717238    
    In response to james 14

Good. Glad it is gone.
Was it misaligned from the center of the leafsprings?

Old School GM fan FOREVER


 
james 14 
Forum Newbie
Posts: 58

Reg: 08-28-07
12-12-17 08:22 AM - Post#2717675    
    In response to rockfangd

I'm not sure. The only picture I saw was at the end of the bottom leaf. It was misaligned by almost a half inch. You couldn't see it unless you were up under the truck.

2017 Silverado LT All-Star
5.3 V8
4WD


 
LMC Trucks
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