Basically my lmk dramas truck started shaking badly I couldn’t figure it out at first so I decided to take it to the shop… sat for three weeks and I believe the guys never touched it…. I was advised that the crank shaft was broken and I needed a new engine but when I was out of a truck I did lots of research and gain knowledge on these 2011 lml duramax trucks .. long story short I found out I only spun my harmonic balancer now I need to have it keyed so my engine can be balanced off…