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ACinSC 
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Location: South Carolina
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 Topic: 2018 Silverado suspension noise
Posted: 06 Jul 2023 at 3:05pm |
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Been hearing a bumping noise from the rear of my truck . Did a search and found it may be coming from the leaf springs . Anyone else have this problem and know the fix ? Called the dealer and of course they had no clue . Thanks !!
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Codger
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Joined: 23 Dec 2020
Location: Utopia
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Posted: 06 Jul 2023 at 3:35pm |
I've not heard the specific noise you mention but if certain it is from the leaf springs, there are a couple of things you can do for the short, and long term.
Jack the rear of the truck up and place jack stands under the frame just forward of the leaf spring front mounts and remove rear tires for ease of access. If you have tall stands you can support at rear of the frame also. Using a tapered piece of hardwood, or plastic, drive this piece between the spring leafs spreading them and spray graphite wet to dry slip lube of some sort between the spring leafs. A heavy dry grease will work also but you don't want something that will draw dust or dirt. Do this with each spring leaf front and rear of the drive axle.
Second and more permanent option is using nylon slip pads adhesive attached to the leaf spring leaf ends These are very thin and tough but must be attached correctly to remain in place.
What I suspect you have is the spring leaves slightly rusting together when the truck sits. This rust bond breaks with slight road jarring and is very audible at times. I've seen this on many trucks and cars through the years although have never worked on your described vehicle type.
The second option is best performed by a spring shop as they will select the nylon pad thickness and have the expertise to install them correctly.
Edited by Codger - 06 Jul 2023 at 3:36pm
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ACinSC
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Posted: 06 Jul 2023 at 4:14pm |
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Thanks Rob. From what I see online it looks like a fairly common problem. Don't know why the dealership seemed unaware of it. May crawl under my truck and see if I can find something loose. Thanks again
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PaulB
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Posted: 06 Jul 2023 at 6:21pm |
Back in the 60s one of my fathers Co-Workers brought brand new Ford car. From day 1 it had an odd "clunk" when going around corners. Dealers were no help, mechanics were no help, no one had any solutions. The fellow tried to get the dealer to take back the car, although at the time there were no "lemon Laws". After a few years the car was wrecked in the rear quarter panel were a Coke bottle was found with a note in it "Took You Long Enough Didn't it" 
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Codger
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Posted: 06 Jul 2023 at 8:46pm |
I've never found anything like that in a car taken apart long after it was built but over the years when still fixing wrecked cars from the 60's I used to find a lot of snack bags and such shoved into crooks and crannies plenty. Somewhere around here I have a "Frito's" bag from about 1969 with the "Frito Bandito" character on the package front. I kept it as found it in 1979 shoved into the core support, (radiator support these days) of a 68 Impala that was a friends father's car purchased new by him. Also found a "Giant Robot" character from the "Johnny Sokko and his Flying Robot" TV show of the day, (1960's) and the last thing I remember was a 1967 something TV Guide that was stiff but the pages could be read. This had advertisements from the Detroit, MI area in it so had been there since the car was built. I want to say that was a 1968 Chevrolet Biscayne car so probably and early production unit.
Here is something I found on the Johnny Sokko production:
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Dave H
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Posted: 07 Jul 2023 at 9:18am |
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Is the thumping noise associated with starting and stopping?
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ACinSC
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Posted: 07 Jul 2023 at 12:05pm |
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No, mostly hear it at low speeds on uneven road. Thanks!
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steve(ill)
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Posted: 07 Jul 2023 at 1:01pm |
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clearance between the spring leaves is a common problem.. Some have put in plastic/ rubber spaces as mentioned above... Some have tried Band Clamps or Straps to pinch the leaves closer together to eliminate the GAPS.
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Like them all, but love the "B"s.
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ACinSC
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Posted: 07 Jul 2023 at 6:24pm |
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Thanks guys for all the good info. I'll see what I can figure out soon.
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shameless dude
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Posted: 11 Jul 2023 at 1:13am |
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had that center bolt break once on my 1 ton, by looking at it, it looked fine, but it was broke and made the noises you describe.
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ACinSC
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Posted: 11 Jul 2023 at 7:36am |
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Ordered a pack of Spring Thing shims. Hopefully they'll fix the noise. Thanks
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