mike170

My 2015 LT just started to vibrate at speeds around 70 MPH. This just started at coincidently, 83k miles. I am the original owner and this s my first issue so far. The AFM for me is completely fine, nobody realizes it switches unless i tell them (dodged a bullet!) Currently the truck drives smooth as it did on day 1 until recently. Even under quick acceleration it drives smooth until 70ish. Thinking doing the custom steel driveshaft to hopefully solve the issue. Is yours still doing good? Do you think that has made the biggest difference? Thanks for the guidance!