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Hello everyone. My first time here. I have a 2021 Sierra AT4 with the 6.2L. I have started to notice a noise when towing our boat that weighs about 6,000lbs. Several times during the trip to and from the lake I hear a rumbling sound that last like 2-4 sec. almost sounds like it can be a jake brake or hitting rumble strips on road. I hit no strips. I can’t recall if it happens on downshift or what. But it does concern me. I drove home from work today with our towing and put it in tow haul mode. It made the noise 3 times in 45 min drive. Any ideas what I’m dealing with? Would it be a bad clutch issue or is this normal? I do have the performance GM installed exhaust and performance GM installed air intake. I called dealer today and they said bring it by and they MIGHT have time to get to it next week. I planned to hit the lake this weekend for Labor Day. Thanks.
Ok, thought I would post after having the Bilstein 6112 front suspension kit placed on my 2021 1500 AT4 today. I've ordered the 5100's for the back, however they won't be in until next week. So, my goal was to get rid of the dang bounce in the truck. The ride wasn't bad, but I thought I would try the 6112's. Immediately I could tell that the truck definitely sits close to level, which I'm ok with a slight rake and I mean slight. I purposely hit a few bumps and the trucks feels more planted or stiffer. It still has a slight bounce, however you can tell the difference and I'm very satisfied. I can't wait until I get the rear Bilstein's installed, as that is where I feel it is most needed.
If you are on the fence about the 6112's, get them fast. They were on backorder, so I jumped on them when they were in stock.
I'll have to take pics later. Model# is BSN-47-309524
I just bought a used 2021 AT4 with the 3.0 with about 3,800 miles. This is my first diesel but I have read a ton of documentation, forums and Facebook groups specific to the 3.0 Duramax. When I got the truck I scrolled through all of the information in the DIC. I noticed that the DEF gauge is a about a third full. I figured the previous owner may have done a lot of towing with it because at 3,800 miles it should not be that low. Am I correct in that assumption? Should I go ahead and fill it up or wait until the truck tells me to? How much do I fill it? Until full?
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