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Clunking from rear of truck when turning or rocking to side , and not head on ?

New to this group …
I have had the same issue as stated in this thread..a clunking noise primarily when I am turning ..been in the shop for 3 weeks and they replaced one leaf spring ..and still there ..they replaced and or repaired diff and noise is still there…now GMC regional is saying that since I replaced wheels (same size tire) and tires and rear shocks (bilstien) that’s the problema and they won’t troubleshoot fuerther …truck has 8k miles and has no lift (just different wheels/tires)

Any ideas of what to do next ?

I’m am thinking of putting OEM tires and wheels back and also the shocks and see what they say now ???

Thanks in advance for your thoughts
Eh, that seems like alot of trouble to go through just to get them to look at something they can't fix anyway. ( most folks get the leaf springs replaced only to have the clunking return. )
 

I had a similar issue in my previous AT4, it was a bad torque converter. It got worse and then started doing it everyone I drive. Google GMC torque converter issue.
Can you elaborate on the noise? I got a pretty good clunk, but it's seems like it might be different then the leaf spring issue. Idk. I feel it in the brake pedal, just coming to a normal stop. Usually under 15mph from a cruising speed of 45+.
 

Can you elaborate on the noise? I got a pretty good clunk, but it's seems like it might be different then the leaf spring issue. Idk. I feel it in the brake pedal, just coming to a normal stop. Usually under 15mph from a cruising speed of 45+.
Heard of a torque converter issue that could possibly cause that.
 

Its the rear leaf springs (most likely). Its a known issue on Sierras and Silverados. I had this issue on my 2023 AT4X (with less than 1500 miles). Dealer told me there isn't a bulletin on it for 2023s yet, but that its generally a known issue and so they replaced the springs for me. The noise is gone.

There is also a product available to fix this - Spring Things - if the dealer won't replace yours or the issue occurs again.
An AT4X had this issue too? That's disappointing. I was about to order the AT4X spec upgrade.
 

Me. Just ordered even though I was going to try my own rubber pad etc. then thought what the heck its not breaking the bank for the truck I love.
UPDATE: I received Springy Things pads yesterday and set about installing just two of them (they come four to a set), one rubber pad each between the top leaf and second leaf, pushed all the way into rebound clip and the gap between two leaves. I had to widen pads zip tie holes towards the outside because my AT4X leaf springs are wider. There was no space to get pads into the front end of rear top and second leaf springs. Prep for above: Raise truck body from rear by placing a jack under two bracket, this will help open leaf springs up a bit; expand gap between top and second leafs using a heave screwdriver or similar too; this helps easily slip pads between leafs.

Replicating one type of sound
when static: With the truck parked in the garage, I get under the truck, lay flat on my back towards the far rear end of the truck, pull down and push body from below and the clunk sound appears to be due to rear leafs rubbing against each other. I purchased the truck end of October, no sounds at all, then over xmas I drove through heavy snow in the mountains and even local, I believe the rear leafs have dust or something accumulated between them; done only 3500 miles from new.

Another sound when moving: when I drive and turn left or right very slowly <2mph, in forward or reverse, I hear a groaning sound from the rear, amplified by the empty bed. Almost thought bolts holding bed to chassis may be loose, I have not verified that yet.

In any case, with two pads installed, I need to take it for a drive to check if anything has improved; else I'll take it to the dealer again and explain/demonstrate the sounds and perhaps have them agree its leaf springs and get replacments (if I'm lucky).

2nd Update: Appears to be much better; exhaustive testing pending
Pics below: The white stuff is just grease I was trying from last week.

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I can relate to the above.

I had no issues with a '23 2500 from new. Until I took it in for it's first oil change at 400 some miles. Immediately as soon as I pulled out of the shop, you had to make a hard right down hill. I heard a squeaky clunk in the rear. Didn't think nothing of it at the time, truck was still new and I was on cloud 9.

In a few days it was really irritating me. You could take one hand in the rear stake pocket and rock truck side to side gently and it would produce the sound. You could step up the multipro gate and get the noise.

I flooded the spring packs and shackles with pb blaster, got the right side to quieten down but not the left completely.

I made an appointment and took the truck, with a tbs in hand and showed the service writer.

The first step is to loosen and re-tighten the u-bolts. But it's a torque to load process. Which means one time use. Anyway, that did not solve it and dealer said they would have to order new spring packs. Parts won't be in until the following day. There was 11 packs setting in the warehouse in Colorado. They put new packs in, but they didn't order new u-bolts, the local Ford dealer had a set and they used them.

Long story longer, the replacement packs have been fine for another 15k miles.

3 things to take from this. 1, The truck has not been on a lift, allowing the axle to hang, since. 2, Maybe Ford has better u-bolts that don't stretch. 3, Why did a gm warehouse have so many on hand? Unless it fits multiple generations or the T1's have had a rush of replacements.
 

I snipped off cable ties soon after following a quick test in and out of the garage; the photos where from when I'd just put them on feeling I may have to remove the pads if they don't help and would have cut the cable ties off anyway.
 

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