im4snow2000

Few months back I had a private shop drop the pan and do a full service (8spd). I have complete trust in this shop. The manager forewarned me it was expensive, due to the time involved (as noted in the video you posted). I spent about $690 on just the transmission service in Oct 2024. My truck's a 2021 with about 55-60k miles at the time. Note that at about 30k the above shop did a simple fluid replacement (maybe flush too, not sure) at way lower cost. The truck is used very lightly, but I hope to keep it a while, hence my potentially excessive maintenance (and these newer transmissions scare me).

Experience the same when remote starting. 2021 1500 with 5.3. Can't recall if I experienced this in prior years, but definitely notice it this year.

Thanks for the great shock info. I have a 2021 1500 Sierra X31 and I want to replace all four corners, without changing the height. I found a package of Bilstein 5100's with preassembled springs on the struts (see below). The provider, Suspension Lifts, is asking for the mfg's suspension code prior to me placing an order. I had to scan the QR code on the drivers side door jam to find all of the codes, list of codes are below. I have no idea which of the 3 digit codes the company is asking for. Any suggestions?

2021 5.3 w/8 spd, X31. 47k miles, 90% local driving. Other than lifter failure at about 12k miles its been great. I do the oil with Mobil 1 about 4-5k miles. Had professional shop service transmission at about 30k, and plan to do it every 2 years since I'll likely run the truck out to 150k or so miles.

Stunning looking truck! Congrats. What tires are on it?

2021 Sierra 1500 5.3 bought in Dec 2020. Now has about 10,500 miles. Check engine light came on last night, and it was running rough. "Check ECS" appeared on dash. Symptoms sound like bad lifter(s). Selling dealer and more local dealer both said they can't look at it for two weeks....and if it is the lifter(s), they're roughly one month out!! Oh, they have no loaner vehicles due to overall industry shortage! Thankfully I have a family from whom to borrow a car.

I had GREAT luck with the company attached (link below). I put them in my 2013 and used them hard and they looked like new after 8 years. I pulled them 2x annually and washed them. The fit was awesome too. https://www.caltrend.com/

That noise is a royal PITA, but fortunately easy and cheap to fix. See attached, specifically page 7ish. Also, see this....https://www.spring-things.com/

Does it occur when rounding a turn at slow speeds, and when the truck is not level (ie, the road is on an angle)?

Here's pic of the rubber installed. Please excuse the dirt. Of note, if you have someone shake the truck side to side with moderate effort, you can recreate the noise. With someone shaking the truck side to side, you can visually see the upper and lower leaf springs moving laterally against each other.....and the upper leaf spring rubbing against the lower leaf spring INSERT is where the noise seems to come from. Whatever material they use to make the leaf spring insert isn't compatible with the steel and/or paint on the upper leaf spring....in my opinion. Nothing like buying a $50k truck and "fixing" it with $3 of rubber.

No. I simply jacked up the truck under the frame, to relieve all weight off the rear wheel. Once up, with the tire slightly off the ground, you can easily drive a screwdriver between the leaf springs near the leaf spring insert (on both ends of the leaf springs), and pry the springs apart, and slide the rubber in on top of the plastic leaf spring insert that is "secured" to the lower leaf spring. The rubber I bought on Amazon and was inexpensive. So far, so good for me....but it's only been a week.

See my 4/25/21 post in the below thread for my solution to the mystery noise.

I think I solved this problem on my 2021 1500 Elevation. I heard no noise when the truck was new, but with more miles, now I'm at 4k, the noise became more prevalent. To summarize, the problem was worse (most obvious) at slow speeds, when turning, and when the truck was on an angle (ie, the road had some slope). Sounds like something is loose. Have someone shake the bed of your truck side to side to recreate the noise, and visually observe the leaf springs, especially at the leaf spring insert to see if this is the source of your issue, to see if this is the root cause of your issue. With much help from this thread, I added some roughly 1/4" rubber to the leaf springs, sitting on top of the leaf spring insert. Refer to TSP 19-NA-129 for pictures of the factory leaf spring insert. This TSP notes to install new rear leaf spring inserts. These are thin plastic (I think plastic) used to separate the metal of the leaf springs. In my case, when you shake the truck side to side to recreate the noise, you can see the individual leaf springs moving side to side, and the noise seems to originate from the upper leaf spring rubbing against the insert. Rather than replace the insert, I simply added a piece or rubber on top of the insert. So far the noise appears to be gone. Whatever material the factory insert is made of doesn't work well with the upper leaf spring that rests against it....resulting in noise when the leaf springs move laterally (ie, rounding a turn on a sloped road surface). At least this appears to the be case once the truck gets some miles on it.

I don't hear it when the truck's level, going over a speed bump at slow speeds, for example. But as you noted, when turning at slow speeds into driveway, which often throws the truck slightly out of level if the driveway starts an incline from the road, is when I hear it. I would think if it were the Ubolts, I would hear it over all bumps, not just when turning.

Thx for posting. The above "cause" doesn't seem right. Definitely don't hear it going over normal road bumps......it's when the truck isn't level. Like noted above, when turning at slow speed and road/truck is pitched at small angle. Seems like it would be bushings on, like noted above, loose u-bolts. As noted, mine has gotten worse with more miles (at 3800 miles now, all on-road and essentially clean roads).