mbingen

Are things like this covered under the factory warranty? I have a bumper to bumper warranty until 46k miles and a power train warranty up to 100k miles

I recently bought a 2015 Chevy Silverado with the 6.2 engine and 8-speed transmission and 15000 miles on it and notice a shaking in the truck but it is not as most people describe. It ONLY shakes when the RPMs are very low and it is cruising. The tachometer jumps up and down (within 100-200 RPMs) when the shaking occurs. Most complaints that I have read are a constant vibration where mine is not. It rides very smooth when the truck is coasting (with my foot completely off the gas), under load (heavy on the gas), or the RPMs are 1800 or higher. This leads me to believe that it is not an out of balance issue with anything related to the tires, drive shaft, or axles like other people have suggested. Maybe Torque converter? Transmission? Engine? To eliminate the shaking I have used the manual gears and just bump it down one gear so the RPMs are between 1700 and 2100 when cruising. Gas mileage is barely effected so that is my solution as of now. Any one else having the same issue I am? Any help or advice would be great.

2015 Chevy Silverado shaking for about a second at a time (tachometer flutters up and down a little when this happens). Everyone says driveshaft but I think it has something to do with the drive train. Torque converter?