Clunk from rear of truck

[bhales]

Ok before i take it into the Dealer i have noticed a light clunk/creek noise from the rear of the truck (bed, leaf springs?) i only notice it when i transition from driveway to street or pulling out of a parking lot. sound like a small dumbell falling over in the bed. i thought it was something in my tool box rolling back and forth so  removed that...nope. then i thought it might be play in my hitch...nope.

 

2018 Seirra SLT leveled 285/60 20s....

[CadillacLuke24]

I would venture a guess in the direction of leaf springs. You could try bicycle tire tube sections between the leafs. 

[BigBadSierra]

Like they said even a good wash will clean them enough they will probably stop. my 2014 was the worst for this I would spray Silicone spray into them every wash.

 

The 2016 never had an issue and 2018 have been fine so far even in the massive amount of salt they have been using here.

[Sierra Dan]

There are a few older threads on this.

Just search leaf spring clunk.

Some members have used old rubber tire inner tube pieces to stop the noise.

[bhales]

thanks guys i will try that, i wash my truck alot since i drive on a gravel/dirt lot for work most days. i was thinking leaf springs, i will try to grease and see if it stops thanks

[bhales]

took my truck in to the GMC dealer i bought it from and shook the rear of the truck and he said its a floating rear end (BS) and took me to another truck 2500 and made it do the same thing

[99Mastercraft]

I battled this issue for MONTHS. Drove me insane, I tried clamping the leaf springs, pressure washing the leaf springs.. lubricating all of that jazz

 

diagnosed by GM.. bad rear leaf spring shackles... out of warranty and gm ran the calculator for me, I paid $250 and they were replaced... good to go, no noise, no clunks

 

mine made the noise backing out of the driveway and when it hit uneven ground

[silveradosid]

99mastercraft what year is your truck and how many miles do  you have on it

[99Mastercraft]

19 hours ago, silveradosid said:

99mastercraft what year is your truck and how many miles do  you have on it

 

2017 GMC Sierra all terrain... 56k miles

 

Forgot to mention, while I was chasing this ghost I replaced the factory rancho rear shocks with bilstein 5100 series too.. the noise wasn’t that bad when it rained and all that stuff got wet, hosing it down with wd40 worked temporarily... I think I got lucky by getting a good dealer/technician to diagnose the issue... everyone else on forums had to replace leaf springs, but of course each issue is different.

[silveradosid]

also did the bilsteins made an improvement bud didnt solve it i will look at the shackles this weekend thanks

[99Mastercraft]

17 hours ago, silveradosid said:

also did the bilsteins made an improvement bud didnt solve it i will look at the shackles this weekend thanks

 

Bilsteins are nice ride... not sure what to look for on shackles... 

[bhales]

well when i took it back to GMC this time for Service 15k miles i complained about the leaf spring noise and told them it was only in the passenger side. low and behold they admitted they had a TSB for them and lubed and tightened them. noise is gone for now..service manager told me next time im in the woods for a long time to make sure i pressure wash them real good. (im not a hunter) but i do live in south Alabama and my truck is around saltwater/sand alot at the boat ramps so i guess that could be the issue. but my 2008 denali never made this noise ever for 260,000 miles.