So I’m not the most knowledgeable when it comes to mechanics and I recently bought a 2018 Chevy Colorado. It does have a lift in it.

Whenever I accelerate to about 60-70 the truck will almost vibrate. It’s not a constant vibration, it’s a few seconds long then will stop for 5-10 seconds then start again. it feels like it’s coming from the back driver side of the vehicle. It immediately stops when I let go the gas but returns as soon as I put any gas in it. Once I get to those higher speeds it sometimes does it at lower speeds like 30-40. (Only after I’ve already reached the higher speeds) Also if I’m accelerating at decent speed then let go of the pedal the car will slightly drift to the right.

My first thought was it was an alignment issues so I already took in to get an alignment. And it still does this.
I’ve noticed the vibrating only happens when the car is at certain RPMs. The RPM will slightly go up as it’s vibrating then go a little down when it’s not. It usually happens around 1 rpm and 2 rpm but I really don’t know what to think.

I’ve uploaded a video of the dashboard to show what I mean of the RPMs, I was giving it gas the whole video. Any advice or help is much appreciated!

 

I have same model 2018 Colorado zr2 did the same...turns out I had to take to dealer to have transmission fluid drained and replaced...smoothed it right out...If your truck has more than 50,000 miles on it it may need a flush,...that may be your problem..It's refered to as the "chevy shudder"
mine was done under warranty, if you have to pay it may cost around $300.oo