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Message: <blockquote data-quote="ondersma80" data-source="post: 21853" data-attributes="member: 8088"><p>I started to notice this rumble around 1200-1300 rpm when I reached a couple hundred miles on my 2024 LT. I found it most noticeable when cruising 55 then turning into my 20 mph neighborhood. When maintaining 20 mph the transmission stays in 5 or 6 and engine hovers around 1300 rpm and I get that vibration rumble. Sounds like a subwoofer in test mode. I took it to the dealer and they ran a TCM update. After a week, rumble gone. When I repeat the previous I notice it stays in that high gear for about a half second then shifts while cruising 20 and keeps the engine more around 1600 rpm and no more rumble. Easy enough fix. I have the bulletin number on my paperwork and can grab it if needed.</p></blockquote><p></p>